Q.6 Fill in the blanks in the following.
(a) A person 1 m in front of a plane mirror seems to be ______ m away from his image.
(b) If you touch your ______ ear with a right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with _____
(c) The size of the pupil becomes _______ when you see in dim light.
(d) Night birds have _______ cones than rods in their eyes.


Answer :

(b) A person 1 m in front of a plane mirror seems to be 2 m away from his image.

(b) If you touch your left ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with the left hand.

(c) The size of the pupil becomes large when you see in dim light.

(d) Night birds have fewer cones than rods in their eyes.

EXPLANATION

A person 1 m in front of a plane mirror seems to be 2 m away from his image. Because his image will be 1 m from the mirror and he is 1 m from the mirror. So distance between image and object(person) is 1m + 1m = 2 m

If we touch our left ear with right hand in front of a plane mirror it will be seen in the mirror that our right ear is touched with the left hand. This is because of lateral inversion of images that takes place in a plane mirror.

The size of the pupil becomes large when we see in dim light because our pupil expands to allow more light to enter our eye.

Cones function best in relatively bright light, while rod cells work better in dim light.

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