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Part of the eye which controls the light entering is called

Part of the eye which controls the light entering is called the iris. Iris controls the size of the pupil which regulates the amount of light entering into the eye.

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2

We can see a non-luminous object when light:

 3

Light is falling on surface S1, S2, S3 as shown in Fig.16.1.




Surfaces on which the angle of incidence is equal to the angle of reflection is/are


 4

A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in Fig.16.2 as A, B, C and D. In which position mirror will be visible?





 5

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Fig. 16.3. The pencil of light coming out of the hole falls on a mirror.


At which point should the eye be placed so that the hole can be seen?