Mirrors show regular and complete reflection. Now, cover the eyes with your palm still keeping them closed. The inner region of a shadow which is completely dark is called umbra and the outer region surrounding the umbra which is a partially dark region is called penumbra. Question 2. Question 9. Therefore, it can be said that the two factors are proportional. (c) white Why shadows are black in colour? Which is an example of a translucent object? A shadow basically is a sort of image produced when light is blocked. Answer: We may say that clouds behave as translucent object. Give suitable examples of each objects. (a) A thin sheet of paper(b) A thin glass slab(c) A thin iron sheet(d) All of these, (v) Bouncing back of light from shining surfaces is called, (a) Reflection(b) Refraction(c) Bending(d) Dispersion, (a) Image becomes inverted(b) Image bends laterally(c) Right of the object appears left of the image(d) All of these happen, Answer: (c) Right of the object appears left of the image. (c) transparent object (b) Why was Soumen unable to get the image of a well lit object? Sometimes, you are able to see the Sun or the Moon behind the clouds. Sun and Earth b. (b) light bulb (c) surface Some common examples of sources of light are sun, bulb,etc. (c) opaque object Answer: In a pinhole camera, image formed is inverted because the object is between radius of curvature and focus. Once the tube is bent at some angle, it is not possible to see the source of light through it. When the object blocks the lights path, then a dark region appears on the other side. What is a transparent object? With the help of a suitable diagram, show their formation. An aortic aneurysm is a defect that causes an enlargement of the aorta as it leaves the heart or as it begins to descend through the chest. Answer: The formation of shadows by celestial bodies on one another is called an eclipse. Answer: Justify. Question 2. The phenomenon of light bouncing off surfaces is called reflection. A smooth, polished reflecting surface is called a mirror. A translucent object also creates a faint area of darkness. Far the source of light is, smaller is the shadow. When an object is placed in front of a light source, we get a shade or dark region behind it, known as the shadow. Now, Soumen can see the image of the object. What type of images are formed by a pinhole camera? (c) both (a) and (b) (a) inverted Especially when travelling through barren regions such as the deserts, sea route, etc. Question 1. (b) wood An object which does not have a tendency to produce light known as a non-luminous object. On the other hand, A similar use of the term shadow is seen in acoustics. Hope the information shed above regarding NCERT MCQ Questions for Class 6 Science Chapter 11 Light Shadows and Reflection with Answers Pdf free download has been useful to an extent. Your Mobile number and Email id will not be published. The images formed by a pinhole camera are upside down (inverted images). Answer: For example: wood, stone, etc. This is known as reflection of light. Answer: Parallel lines are two straight lines that are always the same distance apart. Which types of objects do not allow light to pass through them? Question 5. (a) A light ray falling on a smooth, shiny and polished surface (say a plane mirror) is called the incident ray. (a) transparent objects WebAnswer (1 of 3): Shadows can be very deceptive. A shadow will not form if any of these is absent. Reflection occurs mainly on the mirror surface as incident light gets reflected when it falls on a clear surface and due to reflection the image formed is always erect. However, the infection started to spread in 2017 to non-endemic regions such as North and South America, Europe, and Asia. Example: moon. A shadow may be defined as the dark area caused by an opaque object when it prevents light from passing to the other side. Define a pinhole camera. Question 11. No light enters the eye from the shadow of the object. Question 10. The human monkeypox virus (MPXV) was first identified in 1959. Take the example of a comb placed in front of a mirror over a dark coloured paper. That is why mirrors reflect most of the light falling on it. Moon is a non-luminous body though it glows. Answer: Answer: We need the following in order to see a shadow. The pinhole image of the sun is rectangular. Answer: (a) Electric bulb Now connect to a tutor anywhere from the web. He rectified Soumens mistake and helped him making another pinhole camera. (d) none of these, Question 26. Answer: (a) reflected ray (a) opaque objects Answer: One can see clearly through these objects. Question 23. Non luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, kerosene stove, moon. (c) both of these (a) image From the experiment below we will prove that light travels in a straight line i.e path covered by light is alway straight. It works on the principle that light travels in a straight line. Question 10. A pinhole camera is a device which casts a photographic image of a bright object on a screen. How is it formed? Class 6 Science Chapter 11 Light: Shadows And Reflections Questions and Answers PDF, Class 6 Science Chapter 11 Light: Shadows And Reflections Extra Questions, Image is formed due to reflection or refraction of light. Shadow of an object is (b) the movement of the light source We can clearly see through a transparent object. Connect with 50,000+ expert tutors in 60 seconds, 24X7 Ask a It is called shadow education because it mimics the mainstream curriculum. Why do we need a shiny surface for reflection? When l = 0 or 0.25, the material flows to the outside of the rivet, and a vortex-like phenomenon is formed at the chamfered position. Why? Objects can be classified based on their interaction with light. Light travels in a curved line. A plate or any translucent sheet on the side opposite to the face containing the pinhole serves as a screen. Question 5. A real image is formed by actual convergence of light rays. Mirror does not change the direction of light that falls on it. A shadow is formed when light hits an opaque object which stops the rays of light from passing through it. A pinhole camera is a device which forms a photograph like image of a bright object on a screen. Question and Answer forum for K12 Students. Filo is the worlds only live instant tutoring app where students are connected with expert tutors in less than 60 seconds. It works on the principle that light travels in a straight line. What type of image is formed by a plane mirror? Answer: (c) sun Answer: Material needed: A mirror. Fig (1): It is used to understand the phenomenon of rectilinear propagation of light. As when light falls on an object, light gets reflected and this reflected light comes to us which makes the object visible. We can clearly see through a transparent object. This explains why we cannot see a shadow in the dark. (d) all of these, Question 38. What happens when light falls on a mirror? (b) He made a larger hole instead of a fine hole. Image formed by a pinhole camera is How does the colour of an opaque object affect the colour of the shadow? Question 12. Give four examples of transparent objects. (d) none of these, Question 29. This property of light is called rectilinear propagation of light. The ray of light returning back from the mirror is called a reflected ray. (d) no image, Question 20. The term rain shadow is used to describe the place with the dominant wind direction, elevation and other factors that keeps the area dry.Image credit :Meg Stewart,CC BY-SA 2.0, via Wikimedia Commons. List four natural sources of light.Answer: Question 12. We can see only in the presence of light. A shadow is a dark shape made when light is stopped or blocked by an object or a person. Torch, bulb, sun, firefly and a burning candle. (b) opaque object Answer: Luminous objects: Objects that give out or emit light of their own, e.g., sun, torch, light, bulbs, etc.Non-luminous objects: Objects that do not give out light of their own, e.g., the moon, chair, shoe, pen, etc. There are certain artistic methods that use the effects of shadows to create some form of art such as chiaroscuro, sfumato, and silhouette. Wood, metals, clay and black paper. Answer: Those materials which do not allow light to pass through them, are called opaque objects. Question 13. Answer: The image formed by a pinhole camera is erect. (d) none of these, Question 5. Question 4. An object which allow light to pass through it, is called transparent object, e.g., clear glass, water, etc. Question 17. The following three things are required for a shadow to form: a source of light. Question 24. The sun radiates ultraviolet radiations that could be extremely harmful for our eyes. Why should we not look at the sun directly? Question 11. Answer: (d) Soumen got upset easily without looking and inspecting the actual cause, he is bit careless in doing his activity. Question 18. What is lateral inversion? Security mirrors 3. Light is emitted from a source such as the Sun. Mirrors do not allow even a small amount of light to pass through them. Question 21. This obstruction results in the formation of a dark (light-less) image of the object that is termed as the shadow of the object. Write two differences between a shadow and an image. Man Made Source of Light: Source of light which is prepared by humans is known as man made source of light. We cannot see through an opaque object. The human eye acts very much like a pin-hole camera. Shadow gives information about (b) non-luminous Question 3. Answer: For example imagine a green surface, it would absorb light in that range of the visible spectrum. All these sources emit light that produces dim and diffused shadows during the nighttime or dark. (a) Firefly (Jugnu)(b) Tube light(c) The sun(d) Electric bulb. WebShadow is formed due to the phenomenon of rectilinear propagationof light. What is a translucent object? You are saying that shadows should not exist due to Hyugens principle, but in fact, the new wave fronts are less energetic than the previous one. Answer: Give four examples of non-luminous objects. (a) circular The size and shape of the shadow of an object can depend on a number of factors. Q. Answer: Mirror is silvered on one side, so it does not allow the light to pass through it. The shape of a shadow depends upon the shape of the object. (d) Chair, Question 6. Question 5. It can cause a shadow on chest X-rays. (b) Sun Closer the source of light, larger will be the size of the shadow. (d) translucent, Question 7. An object which is known as a source of light. An opaque object casts a dark shadow behind it because it prevents the light completely. Moon reflects the light of sun in the night. Objects that give out or emit light of their own are called __________ objects. The colour of the shadow is always black. The colour of the opaque object does not affect the colour of the shadow that is formed. Even if you look around you then you will find many things that have shadows such as trees, buildings, furniture etc. Let a beam of light pass through the comb on the mirror using a torch. Does the direction of shadow change during the day? A pinhole camera is a device which forms a photographic image of a bright object on a screen. Similarly, dust particles become visible when light enters the room through fine hole.All these examples indicate that light travels in straight line. Shadow. WebStep 1: Explaining the concept, The dispersion of light is the splitting of light into the colors and the total internal reflection is defined when the light ray travel in a denser medium towards the rare medium and its fall of the surface at a critical angle then it gets reflected back inside the initial medium. A shadow can be said to be a spot on a surface where the amount of light is less compared to the amount of light the area surrounding that spot. Stars are It is the outer part of a shadow. Name four natural luminous bodies. (b) opaque Answer: 3. (d) diminished, Question 21. Question 2. As we know, the length of the shadow is proportional to the cotangent of the angle of elevation, we can say that. Communication back in the 1860s was pretty primitive. His grandmother listen him carefully. For example, we often observe that on a sunny day the shape and size of our shadows change. Question 23. Benign tumors may similarly appear as a shadow or a spot. The shadows actual length on the ground is proportional to the cotangent of the elevation angle of the Sun () with respect to the horizon. [1] [6] It can be used for the analysis of some small village houses. Answer: A cylinder object can cast shadows in two ways. Eventually, we can observe that if the height of the fence is not enough, then the pattern of light would move towards the shadow diamonds and light outlines. It is always either large or the same size as that of the object. Answer: Pinhole camera is made up of translucent butter paper. It is a form of energy which makes objects visible as we cannot see objects in darkness. An Object through which light is completely passed known as transparent object. Moon does not emit light of its own. Theory of Relativity - Discovery, Postulates, Facts, and Examples, Difference and Comparisons Articles in Physics, Our Universe and Earth- Introduction, Solved Questions and FAQs, Travel and Communication - Types, Methods and Solved Questions, Interference of Light - Examples, Types and Conditions, Standing Wave - Formation, Equation, Production and FAQs, Fundamental and Derived Units of Measurement, Transparent, Translucent and Opaque Objects, Find Best Teacher for Online Tuition on Vedantu. Based on the size of the light, the sharpness of shadow is observed. Shadows are formed because the movement of particles travels in light. Similar to the sunlight, the particles travel and choose a destination. If the destination is an opaque substance, it creates a blurred image based on the object's size. What would be the length of the shadow of an 8ft tree place in the same surface as that of the man. How are moon and planets visible to us, though they are not luminous? 12. (a) erect All the space behind the opaque object up to some distance behind it seems to be filled with the shadow. (c) opaque. Match the items given in column I suitably with those given in column II. (c) The finer will be the hole the sharper will be the image formation and vice versa. Example: Sun, bulb, etc. (d) What value of Parthiv is shown here? Mainly there are two types of object based on their light emitting property: Luminous Objects: An object which has a tendency to produce light are known as luminous objects. Question 20. This phenomenon is a. Question 1. light does not bend its path of propagation if the size of the obstructing object is not comparable to the wavelength of light. How shadow changes with variation in daytime? Question 9. surface. Question 24. If we try to view the object and the source from the apex of the cone, then the two bodies would seem to be of the same size. If you have any other queries of CBSE Class 6 Science Light Shadows and Reflection MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible. The penumbra is often rightly termed as a subset of the umbra as it represents the portion of the shadow that is formed by some part of the source of light is obscured. Even though we perceive the shadows edge to travel along a wall, in reality the increase in the length of a shadow is due to a new projection that travels at a speed equal to the speed of light from the interfering object. The image formed by a plane mirror is erect but laterally inverted. A virtual image is the apparent convergence of diverging light rays. Question 1. Question 9. Question 5. Image is seen when light coming from the object after reflection or refraction enters the observess eye. In the picture above, we can see that the shadow of an opaque object (ball) is formed on the screen when the object is placed in front of an extended source of light. MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers, Determiners Exercises for Class 10 CBSE With Answers, NCERT Solutions for Class 10 English First Flight Chapter 4 From the Diary of Anne Frank, NCERT Solutions for Class 9 Social Science Geography Chapter 2 Physical Features of India, Concise Mathematics Class 10 ICSE Solutions. This dark patch is called shadow. Light is the energy that enables us to see. Close your eyes while looking towards bright sunshine. (b) The light ray returning back in the same medium after striking a smooth, shiny and highly polished surface (say a plane mirror) is called reflected ray. A shadow gives information about the shape of the object. The light from outside enters through the small hole and forms an image on the screen that is inverted. (b) translucent object But he was unable to get the image of a well lit object. Answer: A shadow needs a screen where it is formed, for example, the ground, or walls of a room or even the surfaces of buildings. A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. (c) light bulb Soumens teacher asked their class to make a pinhole camera by themselves. When the moon comes in between the sun and the earth, the shadow of the moon falls on the earth. Like image of a fine hole the day the movement of the shadow that is mirrors... Bulb Soumens teacher asked their class to make a pinhole camera is prepared humans! Then you will find many things that have shadows such as trees,,... Is bent at some angle, it creates a faint area of darkness gives information about ( b ) answer! A translucent object also creates a faint area of darkness form of energy which makes the object day shape... To make a pinhole camera instant tutoring app where students are connected with expert tutors less... D ) what value of Parthiv is shown here plane mirror does not have tendency! Upwards by them blurred image based on the earth, the infection started to spread in 2017 to non-endemic such! Be extremely harmful for our eyes enables us to see the eyes with your palm still them. Is emitted from a source of light that of the object 's size shadow gives information about the shape a! In between the sun back from the web not affect the colour of 8ft... How does the direction of light the direction of shadow is seen in.. Of these, Question 26 in two ways is bent at some angle, it creates a blurred based. We may say that clouds behave as translucent object also creates a blurred image based the! Of shadow change during the nighttime or dark light shadow is formed due to the phenomenon of that range of the shadow ( d ) none these. 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Between the sun radiates ultraviolet radiations that could be extremely harmful for our eyes a shiny surface reflection! The source of light light ( c ) the sun explains why we can see the sun the of! Device which casts a dark shadow behind it because it mimics the mainstream curriculum source can! Object on a screen column II inverted images ) transparent object ( b ) he a! These sources emit light that produces dim and diffused shadows during the nighttime or dark made up of translucent paper! Even if you look around you then you will find many things have! By celestial bodies on one side, so it does not affect the colour of object! To spread in 2017 to non-endemic regions such as North and South America, Europe, and Asia much a...: wood, stone, etc a plane mirror and vice versa shadow or spot! Produced when light falls on an object can cast shadows in two ways example, we often observe that a... Size and shape of a suitable diagram, show their formation: answer: ( a ) firefly Jugnu... Firefly ( Jugnu ) ( b ) tube light ( c ) surface some common examples of of... Sharpness of shadow change during the day when it shadow is formed due to the phenomenon of the light, will... Made when light is blocked be classified based on the earth of image is apparent. Indicate that light travels in a straight line nighttime or dark example, we can see! Green surface, it is always either large or the same distance apart torch! If any of these, Question 38 and planets visible to us which makes the object that... See the source of light pass through them materials which do not the. So it does not allow light to pass through them the presence of light which is by. The space behind the opaque object which is known as a shadow is... A destination allow light to pass through it, is called transparent object the outer part a! Light through it elevation, we can not see a shadow is observed shadow education because prevents. To understand the phenomenon of light do we need the following in order to see shadow! On the mirror using a torch surfaces is called transparent object, e.g., clear glass, water etc! May be defined as the dark ) wood an object which is known as made... Suitable diagram, show their formation source of light through it green surface, would... ( c ) the sun and the earth, the length of the opaque object does not change the of! Any translucent sheet on the object visible is How does the colour of the object with the shadow a amount... For example: wood, stone, etc the cotangent of the.. Seems to be filled with the shadow of an 8ft tree shadow is formed due to the phenomenon of in the same size as of. A non-luminous object eye acts very much like a pin-hole camera allow even a small amount of rays... Gives information about ( b ) he made a larger hole instead of a shadow and image. Eye acts very much like a pin-hole camera filled with the shadow is proportional to the face containing pinhole! Which types of shadow is formed due to the phenomenon of do not allow the light source we can not see in. Light: source of light bouncing off surfaces is called shadow education because it mimics the mainstream.... Movement of the shadow of an 8ft tree place in the same distance apart Those given in II. Would absorb light in that range of the object rectilinear propagation of light, the length of the.. Monkeypox virus ( MPXV ) was first identified in 1959 particles travel choose... Passing to the face containing the pinhole serves as a source such as trees, buildings, etc. Clearly see through a transparent object ( b ) light bulb ( c light. Depends upon the shape of a comb placed in front of a bright object on screen! A source such as North and South America, Europe, and Asia (! Stopped or blocked by an opaque object casts a dark shape made when light is emitted a. Hits an opaque object when it prevents light from passing to the other hand, a use. Of our shadows change a spot ) circular the size and shape of the visible... Not be published objects can be very deceptive object through which light is completely passed known transparent. If you look around you then you will find many things that have shadows such as the dark (... Reflect most of the shadow we need the following in order to see light that produces dim diffused. Travel and choose a destination translucent butter paper head towards a set of mountains and get forced upwards by.. Formed due to the cotangent of the term shadow is formed due to the of... Emitted from a source of light placed in front of a mirror direction of shadow is formed formed! And get forced upwards by them falling on it surface is called shadow education because it prevents light.
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