Light Shadow and Reflection NCERT Solutions for Class 6

NCERT solutions for Light Shadows and Reflections Class 6  Light Shadow and Reflection provided below will aid students in scoring better marks in their exams. The solutions are prepared by the top subject-matter experts at SimplyAcad to help students boost their confidence and clear all the doubts raised. Students must make sure to complete all the questions of the textbook exercise to cover all the important sections of the chapter. These solutions can also be used as a guide for last minute revisions.

NCERT Solutions for Class 6 Light Shadow and Reflection

Class 6 Science Chapter 11 Exercise

1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Ans:

2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or 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, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the fame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.
Ans:

3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way? \textbf

{Solution} When a cylinder is held in sunlight, a circular shadow or a rectangular shadow can be obtained depending on its orientation relative to the Sun. When the top of the cylinder faces the Sun, the shadow formed is circular. On the other hand, when the side of the cylinder faces the Sun, the shadow formed is rectangular.

4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
Ans: No, in a completely dark room no image will be formed because there is no light in the room so no reflection of light takes place and no image will be formed.

Class 6 Science Chapter 11 VERY SHORT ANSWER TYPE QUESTIONS

1. Whether the moon is a luminous or non-luminous body?
Ans: Moon is a non-luminous body.

2. What is umbra?
Ans: Umbra is the dark region behind objects facing light which does not receive light at all.

3. How does a light ray travel?
Ans: Light ray travels in a straight line.

4. Give one natural source of light.
Ans: Sun is a natural source of light.

5. What is shadow?
Ans: Shadow is the dark space behind an opaque object where light does not reach.

6. What is penumbra?
Ans: The less darker shadow formed penumbra.on the periphery of dark shadow is called penumbra.

Class 6 Science Chapter 11 SHORT ANSWER TYPE QUESTIONS

1. State difference between a luminous and a non-luminous body.
Ans: The bodies which emit light are called luminous bodies. Example: sun, stars, burning candle etc.

The bodies which do not emit light are called non-luminous bodies. Example: moon, earth, blackboard.

2. Why is the moon not considered as a luminous body?
Ans: Moon is a non-luminous body because it shines by reflecting the sunlight falling on it.

3. What is an incandescent body? Give an example.
Ans: The bodies which emit light when heated to a very high temperature are called incandescent bodies. Example: electric bulb.

4. When does a shadow form?
Ans: Shadow is formed when light does not reach behind the opaque object kept in the path of light

5. Draw a diagram to illustrate the formation of umbra and penumbra.

Ans:

6. What are the essential conditions for the formation of shadow?
Ans:
(1) There should be an opaque material.

(2) There should be a source of light and screen.

The object must be placed in the path of light. Then a shadow is formed on the screen.

7. Define reflection of light.
Ans: When light rays after striking the smooth and shiny surface return to the same medium, this phenomenon is called reflection of light.

8. Write the difference between shadow and image.
Ans:

9. How will you convert a glass sheet into a translucent sheet?
Ans: There are following two methods to convert glass sheet into a translucent sheet:

(i) By smearing a thin layer of oil on a glass sheet.

(ii) By covering a side of the sheet with butter paper.

10. What is shadow? How does the colour of an opaque object affect the colour of the shadow?
Ans: A dark outline or patch formed by an opaque object that blocks light coming from a source of light is called shadow. The colour of an opaque object does not affect the colour of the shadow.

11. Write the differences between umbra and penumbra.
Ans:

12. What do we need in order to see a shadow?
Ans: We need: (i) A source of light (ii) a screen (in) an opaque object.

13. What do you mean by scattering of light?
Ans: When a beam of light falls on a rough surface it is turned back in different directions. It is called scattering of light.

14. A and B are facing the mirror and standing in such a way that A can see B and B can see A. Explain this phenomenon.

Ans: The light rays from A falls on the mirror and gets reflected and reaches B, the light from B falls on the mirror and reflects to reach A. The path of light is just reversed as shown.

15. ‘X’ is 20 cm away from the mirror. If he moves few steps closer to the mirror what will happen to the image

Ans: The size of the image will be the same as the size of the object.

16.Write the mirror image of ‘SMART’?
Ans: THAM8

17. Have you ever seen an ambulance? It is written in the form of a mirror image on vehicles. Explain why it is done so and give the mirror image of AMBULANCE.

Ans: The mirror image of AMBULANACE is aovt/yuaMA.

It is written so on the vehicles for the people to see in their rear view mirrors, read it correctly and immediately give way to the vehicle as it carries patients who need urgent medication.

18. You have to cast the shadow of your pencil on the wall with the help of a candle in a dark room. How can you obtain a shadow of the same size, small size and big size of the same pencil?
Ans: (a)The shadow of the pencil will be small when the pencil is taken close to the wall and away from the candle.

(b)The shadow will be big in size when the pencil is taken closer to the candle.

(c)To get the same sized shadow as the pencil is, adjust the distance between the wall, pencil and candle at equal distances.