Question

Which of the following is used in solar cooker?

• A. Concave lens
• B. Prism
• C. Concave mirror
• D. Convex mirror

Hint:

Devices requiring concentration of light or heat generally use concave mirrors because they converge parallel rays to a focus.

Answer 1

The Correct Option is C

Concept: A concave mirror is a converging mirror that can collect and focus parallel rays of light at a single point. Explanation: Sunlight reaching the Earth consists of nearly parallel rays. A concave mirror reflects these rays and brings them to its principal focus where the heat energy becomes highly concentrated. This concentration of solar energy produces very high temperature which is used for cooking food in solar cookers. Convex mirrors spread light rays outward, so they cannot concentrate heat effectively. Therefore, concave mirrors are used in solar cookers.