Sunlight can be converged and focussed to heat up and cook food. A mirror can be used to focus the sunlight.

concave

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convex

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Solution

The correct option is A concave
Concave mirrors converge the light rays that incident on them.

Sunlight, when focussed, can be used to cook food. Concave mirrors are used to focus the sunlight.

This phenomenon is used by a cooking device known as a solar cooker.

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[UPSEAT 2002]

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