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NCERT solutions Science Textbook For Class 8 chapter 16 Light

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Chapter 16 - Light

Pages 212 - 213

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain

Q 1 | Page 212 | view solution

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Q 2 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Polished wooden table

 

Q 3.1 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Chalk powder

Q 3.2 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Cardboard surface

Q 3.3 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Marble floor with water spread over it

Q 3.4 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Mirror

Q 3.5 | Page 212 | view solution

Mention against the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in this case.

Piece of paper

Q 3.6 | Page 212 | view solution

State the laws of reflection.

Q 4 | Page 212 | view solution

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Q 5 | Page 212 | view solution

Fill in the blanks in the following.

A person 1 m in front of a plane mirror seems to be ____ __ m away from his image.

Q 6.1 | Page 212 | view solution

Fill in the blanks in the following.

If you touch your ________ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your _________.

Q 6.2 | Page 212 | view solution

Fill in the blanks in the following.

The size of the pupil becomes ________ when you see in dim light.

Q 6.3 | Page 212 | view solution

Fill in the blanks in the following.

Night birds have _________ cones than rods in their eyes.

 

Q 6.4 | Page 212 | view solution

Angle of incidence is equal to the angle of reflection.

(a) Always

(b) Sometimes

(c) Under special conditions

(d) Never

Q 7 | Page 212 | view solution

Image formed by a plane mirror is

(a) virtual, behind the mirror and enlarged.

(b) virtual, behind the mirror and of the same size as the object.

(c) real at the surface of the mirror and enlarged.

(d) real, behind the mirror and of the same size as the object.

Q 8 | Page 212 | view solution

Describe the construction of a kaleidoscope.

Q 9 | Page 212 | view solution

Draw a labelled sketch of the human eye.

Q 10 | Page 212 | view solution

Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?

Q 11 | Page 213 | view solution

Explain how you can take care of your eyes.

Q 12 | Page 213 | view solution

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Q 13 | Page 213 | view solution

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Q 14 | Page 213 | view solution

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Figure. Draw the reflected ray from the second mirror.

Q 15 | Page 213 | view solution

Boojho stands at A just on the side of a plane mirror as shown in Figure. Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R?

 

Q 16 | Page 213 | view solution

Find out the position of the image of an object situated at A in the plane mirror

Q 17.1 | Page 213 | view solution

Can Paheli at B see this image?

Q 17.2 | Page 213 | view solution

Can Boojho at C see this image?

Q 17.3 | Page 213 | view solution

When Paheli moves from B to C, where does the image of A move?

Q 17.4 | Page 213 | view solution

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