The purpose of the glass cover on top of a box-type solar cooker is to

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Allow one to see the food being cooked

Allow more sunlight into the box

Prevent dust from entering the box

Reduce heat loss by radiation

answer is D.

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Detailed Solution

The purpose of the glass cover on top of a box-type solar cooker is to reduce heat loss by radiation.
The box-type solar cooker is a device used for cooking food by utilising solar energy. The solar cooker is kept in the sunlight, and the food inside it gets cooked. Glass cover is placed on the top of the cooker so that heat loss can be reduced from the cooker. However, heat loss may occur because the system tries to acquire thermal equilibrium. Also, the major disadvantage of this cooker is that it cannot be used at night and cooks food very slowly.

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