CBSE - X - Physics - Light - Reflection and Refraction
Answer the following questions regarding box type solar cooker;
1)Why is its interior part painted black?
2)Why is it covered with double planed glass lid?
3)Why is a plane mirror reflector used?
4)What is optimum temperature obtained by this cooker?
5)State any two of its advantages and limitations?
- The interior of a solar cooker is painted black because black surface is good absorber of heat energy.
- Double plane glass lid allows more solar energy to enter the box but does not allow it to flow out in the form of radiant heat.
- To reflect solar energy into the box.
- 100 °C to 140 ºC
(i) Free of cost.
(ii) Does not produce smoke
(i) Cannot be used during the night time.
(ii) Cannot be used for baking or for frying.
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