Question

Which of the following types of mirrors are used to collect heat radiations in solar devices?

• A. Plane mirror
• B. Convex mirror
• C. Concave mirror
• D. all of the above

Answer 1

The correct option is C

Concave mirror

Correct option:

1. Concave mirror:
   1. The incident rays coming from infinity are converged at the focal point by a concave mirror.
   2. Thus, it is used in solar devices to concentrate sunlight at a point.

Explanation for incorrect options:

1. Plane mirror :
   1. The rays of light are deflected by this since the normal to the complete mirror is the same.
2. Convex mirror:
   1. The rays of light falling on the surface of a convex mirror get diverged.

Hence, the correct option is (C).