Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Light, Exercise 7: Chapter Test

Name the part of the eye which controls the amount of light entering the eye.

Name the part of the eye which converges light rays to form the image.

Name the cells on the retina of an eye which are sensitive to bright light.

Name the cells on the retina of an eye which are sensitive to dim light.

The speed of light in vacuum is $3\times {10}^n \mathrm{m} {\mathrm{s}}^{-1}$. Write the value of $n$.

What controls the amount of light entering the eye?

What controls the size of the pupil?

Briefly mention which of the following will cause regular reflection of light and which diffuse reflection of light

(a) Polished wooden table   (b) Chalk powder   (c) Cardboard

(d) Mirror                              (e) Paper                (f) Marble floor with water spread over it