Fill in the blanks in the following :

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




Distance of the person from mirror is same as the distance of his image from the mirror


If a person is 1 m away from the mirror, his image will also be 1m from the mirror

Thus, the image will be 1+1 m (= 2 m) away from the person

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


Left hand


This is because of the lateral inversion of the image

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




In dim light,the light which enters our eye is very little,so to increase the amount of light,the size of pupil increases

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




Rods helps in vision during the dim light and cones help vision in normal or bright light

Since Night birds can see in the night and not in the day,

Therefore, they have more rod cells.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo