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Q.

Why should glass plates be used to cover solar cookers?


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a

To trap more sunlight.

b

To make sunlight reflect.

c

To make sun rays refract.

d

None of above 

answer is A.

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Detailed Solution

Concept: Solar cookers absorb heat from the sun, but this heat needs to be held inside the cooker in order for the temperature to stay high enough to heat the food. A glass is used to maintain the heat inside the cooker by preventing it from escaping.
Sunlight enters the stove box through the glass sheet cover and is absorbed there. It helps to heat the meal by capturing more and more of the sun's heat rays.
Hence, the correct option is 1.
 
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