Why are the vessels of a solar cooker painted black on the outside?

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Solution

Black is a good absorber of heat. Hence, the vessels of a solar cooker are painted black on the outside.

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Similar questions

Q. Two students made box-type solar cookers separately. They both painted the insulated box with black colour from inside, the cooking pots were painted black from outside, and a plane mirror reflector was also attached. One of the students covered the solar cooker box with a transparent glass sheet but the other student covered the solar cooker box with a transparent plastic sheet. Which of the two solar cookers will be more efficient and why?

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