The cover of a solar coker is made of glass because

it absorbs sun's rays
it reflects sun's rays
it retains the heat inside by the green house effect
it rediates heat better than metals

Correct Answer: it retains the heat inside by the green house effect

Explanation:

As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.

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