Question

Convergence of concave mirror can be decreased by
dipping in
(a) Water
(b) Oil
(c) Both
(d) None of these

Answer 1

Answer:

both.... option (c)

Explanation:

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Answer 2

Answer:

(d) None of these

Explanation:

As we know that the mirrors are used to reflect the light incident upon them. The laws of reflection are as follows-

(1) The angle of incident rays of light is equal to the reflected ray of light. So, the angle of incidence is equal to the angle of reflection of light.

(2) The reflected ray, the incident ray and the normal at the point of incident ray all of them lie in the same plane.

Now from these laws of reflection, it is clear that for the reflection of the light, the mirror is unaffected by the effects of dipping. Also, the refraction of the light is not possible in this case so we can say that convergence of a concave mirror is unaffected by any medium.

Therefore, the correct option is (D).