This explains why we cannot see a shadow in the dark. (d) black, Question 35. All the space behind the opaque object up to some distance behind it seems to be filled with the shadow. Now, Soumen can see the image of the object. Question 13. Question 22. Vedantu LIVE Online Master Classes is an incredibly personalized tutoring platform for you, while you are staying at your home. However, the infection started to spread in 2017 to non-endemic regions such as North and South America, Europe, and Asia. Sun is the universal source of light. (d) none of these, Question 10. The won't be any "fuzziness" if we have a single, small source. NCERT Extra Questions for Class 6 Science Chapter 11 Light Shadows and Reflection with Answers will help to score more marks in your CBSE Board Exams. a bright ring of light enclosing the eclipsing body. A shadow is always formed on the side opposite to the source of lightwith respect to an opaque object. (b) incident ray More is the shine and smoothness of the surface, more will be the reflection. (c) both of these Why? Question 10. Answer: Moon is a non-luminous body because it shines by reflecting the sunlight falling on it. Answer: The shape of a shadow depends upon the shape of the object. Question 6. In this article, we will discuss about shadow formation, umbra and penumbra, characteristics of shadows. WebA shadow is an exact copy of an object. It is important for the students to go through these NCERT solutions to get knowledge of the type of question asked in the chapter. The image formed in water is (a) Rubber On the basis of ability to pass light through an object, objects are classified into three main groups, i.e., (a) opaque objects The size of the image formed by a plane mirror is same as that of the object. Answer: Mirror is silvered on one side, so it does not allow the light to pass through it. Why do we need a shiny surface for reflection? Question 4. (c) Opaque Answer: What is a translucent object? Luminous objects: An object which has a tendency to produce light are known as luminous objects. How does it works? (a) shining mirror It only shows the shape or outline of the object and not the details. Question 2. We can see only in the presence of light. A pinhole camera uses a lens to form a real and inverted image. The formation of shadow shows that light travels in a straight line. Answer: This is called lunar eclipse. A mirror reflects a beam of light. E.g. (iii) Which types of objects do not allow light to pass through them? These are pinhole images of the sun. Question 3. Answer: We can see through a translucent object but the vision would be murky. (c) erect but laterally inverted Image is the same size and color as the object. What is lateral inversion? The human eye acts very much like a pin-hole camera. Question 3. What do we need in order to see a shadow? (d) A thin wooden sheet, Question 17. E.g. (a) blue Example: bulb, candle, torch, etc. Answer: Transparent objects are Spectacles.Opaque objects are A stone, wood, a heap of salt, dense smoke, and membrane of tabla.Translucent objects are Blood, milk, wax, skin, balloon, rubber. When a light ray returns back after striking the surface of the plane mirror is called The difference between shadow and reflection is that a shadow is formed by the blocking of light rays by any object. Filo is the worlds only live instant tutoring app where students are connected with expert tutors in less than 60 seconds. All these questions are very important from examination point of view. Question 15. The images formed by a mirror are erect and laterally inverted. (c) translucent Question 16. (b) red We have grown leaps and bounds to be the best Online Tuition Website in India with immensely talented Vedantu Master Teachers, from the most reputed institutions. image. Aim: To observe differences between the image and the shadow of the same object. Question 24. (b) reflection (d) Parthiv is an intelligent and mature boy with scientific aptitude. Stars are This spreading out is called diffraction. So it is a non-luminous body. 1) Ipre early maan uralked on floot and Carried loadle on his leane. The colour of the shadow is always black. Question 7. (d) none of these, Question 16. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. Therefore, when an object stands in the path of light, it obstructs the light rays from propagating. Objects that give out or emit light of their own are called __________ objects. Answer: Name some artificial source of light. the light ray falling on the opaque object is blocked by it. Which types of objects do not allow light to pass through them? (c) sun Question 18. Undergoes lateral inversion (i.e., left-right reversal). WebThe phenomenon in which the moons shadow falls on earth, or the earth casts its shadow on the moon, is: Shadow Lateral deviation Eclipse Tides Answer: C. During the solar 13. Question 13. We are able to see the things around us due to . If you stand before a plane mirror, your left hand appears right. Pinhole camera is made up of translucent butter paper. Afterwards rounded shaped images are formed on the earth. On the same side if the incidence angle is bigger, the shadow is smaller. This is something all of us must have noticed while seeing ourselves in the mirror. When light is incident on a surface, it gets reflected or it bounces back. (d) none of these, Question 24. (a) star Question 3. On dark nights a little illumination by moon enables us to see things around us. The endemic regions were identified in Africas central and western areas. c. Passing of light through object d. All of these. Answer: 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. But he was unable to get the image of a well lit object. Answer: (d) none of these, Question 37. The endemic regions were identified in Africas central and western areas. These two regions in shadows are formed when an opaque body is placed in front of an extended or slit source. Question 27. (c) both of these An area of darkness formed by an opaque object obstructing light is called a shadow. (a) Translucent(b) Opaque(c) Transparent(d) Penumbra. The shadow is formed by the obstruction of light. A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. Some objects are opaque such as stone, metal and wood. It helps us to see the objects from which it comes or from which it is reflected. A shadow may be defined as the dark area caused by an opaque object when it prevents light from passing to the other side. Download Filo and start learning with your favourite tutors right away! Answer: Ask your friend to trace out the outline of the shadow on the screen. What is a luminous object? Close your eyes while looking towards bright sunshine. The phenomenon of light bouncing off surfaces is called reflection. Answer: Web(i) Shadow: A dark patch formed behind an opaque body, when placed in the path of light. With the reduction in distance between the observer and the light source, the relative size of the obstructing body increases till the time it forms a full umbra. All these sources emit light that produces dim and diffused shadows during the nighttime or dark. Write down four man-made sources of light.Answer: Question 14. The size of shadow totally depends on distance between object (c) both (a) and (b) Image source: C. G. P. Grey,British Library Gate Shadow,CC BY 2.0. The opaque obstructing object is capable of blocking the light coming from sun. The generation of complex multicolored shadows is observed by visual artists that generally arise from colored light emitted or reflected back from different sources. Web(e) Shadow (v) Formed due to reflection by mirrors (f) Image (vi) Object through which we cannot see clearly (g) Reflection (vi) Phenomenon of changing left to right (h) Lateral inversion (vii) Produces light of its own Question 9. Answer: (a) Plane mirror(b) Pinhole camera(c) A straight pipe(d) Glass slab. Question 12. Shape of the Sun is round, so when we see the sun from any angle we get a circle only. Water waves, for example, trying to enter an opening in a harbor wall, do not continue in a straight line and the waves appear to spread out from the opening into the shadow of the harbor walls. When l = 0.75 or 1, the material flows to the inside of the rivet, and a vortex phenomenon also occurs. Define a pinhole camera. A pinhole camera is a device which forms a photographic image of a bright object on a screen. (a) inverted Sometimes, you are able to see the Sun or the Moon behind the clouds. Question 14. Q. It glows due to reflection of sunlight by it. Light travels in a straight line. Answer: A shadow is formed when an opaque object comes in the path of light. Air and water are translucent objects. Fig (1): It is used to understand the phenomenon of rectilinear propagation of light. Suggest any two ways to do it. Question 5. It can cause a shadow on chest X-rays. 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. Name sources of light that are not hot. The partial dark region of a shadow around the umbra that gets light from some parts of the source of light is called the penumbra. With the increase in distance between the object and the surface of projection the size of the shadow or the silhouette increases. The formation of shadows by celestial bodies on one another is called an eclipse. ), Element 115, Moscovium:7 Interesting Facts. Any surface that is really well polished or shiny acts like a mirror. A shadow generally takes up most of the space behind an opaque item with light right in front of it. (a) What is solar eclipse? They are formed due to the converging rays of light that comes after reflecting from objects. 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. Which is an example of a translucent object? The length of the shadow also changes from season to season. (a) Electric bulb What is the size of the image formed by a plane mirror? What is light? (d) none of these, Question 14. A shadow is formed when an opaque object is placed in the path of light. It is a form of energy which makes objects visible as we cannot see objects in darkness.During day time sunlight acts as a source of energy which makes everything visible whereas at night we use artificial sources of light for seeing objects. Example: Sun, bulb, etc. Since then, the incidence of the disease has been sporadic. Question 7. Pinhole cameras consist of a closed box having a small pinhole in the front and having translucent screen at the back. An area of darkness formed by an opaque object obstructing light is called a shadow. The shadow of a coloured object is also coloured. What can you say about the ability of such clouds to transmit light? This is called solar eclipse. Frosted glass, wax paper, greased paper and butter paper. What is a pinhole camera? This phenomenon is a. Question 3. (b) Sun (ii) Light always travels in straight lines. : Sun and other stars, Objects that do not produce their own light but reflect the light emitted by luminous objects are known as non-luminous objects. (d) Soumen got upset easily without looking and inspecting the actual cause, he is bit careless in doing his activity. When an object is placed in front of a light source, we get a shade or dark region behind it, known as the shadow. His elder brother on observing his pinhole camera found that the hole made by him was quite large. Question 2. (d) Moon, Question 2. Image formed by a pinhole camera is (d) translucent, Question 7. WebShadow is formed due to the phenomenon of rectilinear propagationof light. What is a non-luminous body? Question 17. there is an opaque object in the way of light. (a) erect To know more about Light Energy, visit the link below; Light takes the quickest path between any two points. The term rain shadow is also used in such a context. Answer: For a round body that obstructs around source of light, the umbra formed has the shape of a right circular cone. The position of the shadow changes with A shadow refers to a dark real silhouette of a person or an opaque object that is generated when the object or person obstructs the light coming from a light source. The unlighted area is called the shadow. Question 18. WebA shadow is formed when an opaque object blocks the path of light because light travels in straight lines.Light cannot bend around the object so it forms a shadow. A similar use of the term shadow is seen in acoustics. The image formed by a mirror is due to _________ of light. These solutions include answers to all exercise questions given in the NCERT textbook. Or, it can even mislead us about the shape of different objects. Q.1 llaito a shert mole sin the finstory iof doumesfert? How are moon and planets visible to us, though they are not luminous? The size of a shadow is relative to the __________ of source of light with respect to the object. Light travels in (b) translucent and Light travels in a Answer: The area in shadow appears black because there is no light falling on it. (c) translucent (c) opaque object When an opaque object is placed in its way, a dark patch is formed behind the object. (b) translucent The dark patch formed behind an opaque object is called a shadow. Does the length of shadow also change from season to season? For this, take a cylindrical tube; which can be easily bent. (viii) Which is a device to image the sun? Give four examples of transparent objects. What is light? An object which does not allow light at all to pass through it, is called opaque object, e.g., wooden sheet, wall, etc. The image formed by a plane mirror is erect but laterally inverted. This dark region is called a shadow. (c) both of these Shadows only occur outside. When the sun is located directly overhead i.e. Question 2. When the earth comes in between the sun and the moon, the shadow of the earth falls on the moon. The shape of shadow depends upon the Images are formed by intersection of reflected rays whereas a shadows are formed when light does not reach behind the object. Question 28. Question 5. (b) opaque object What is this called? What is reflected ray? 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. By smearing a thin layer of oil we may convert a transparent glass sheet into a translucent sheet. Tamilnadu Board Class 10 English Solutions, Tamilnadu Board Class 9 Science Solutions, Tamilnadu Board Class 9 Social Science Solutions, Tamilnadu Board Class 9 English Solutions, MCQ Questions for Class 6 Science with Answers, MCQ Questions for Class 6 Science Chapter 10 Motion and Measurement of Distances with Answers, MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers, The Hundred Dresses Part 2 Class 10 MCQ Questions with Answers English Chapter 6, What Is Modernism In Literature? Substances through which light can pass partially and things cannot be seen clearly through them are A shadow exists because the object absorbs the light. A plane mirror changes the direction of light that falls on it. A pinhole camera can be made with simple materials and can be used to obtain the image of sun and brightly lit objects. Image formed by a pinhole camera is _________ down. (a) reflected ray A pinhole camera is a device which casts a photographic image of a bright object on a screen. Question 5. Let a beam of light pass through the comb on the mirror using a torch. For example: wood, stone, etc. the phenomenon of bouncing back of light by a highly polished surface is called reflection. It is used to view objects like trees and buildings. Write down the similarities and differences. Shadows only occur during the day. (d) none of these, Question 29. Answer: Question 12. Question 1. : glass, Translucent objects allow light to pass through them partially. One mans shadow can be anothers highlight. : Butter paper, Opaque objects do not allow any light to pass through them. 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