Describe a concentrator type solar cooker.

The surface area of a concentrator type solar cooker heater is 5 m^2 . It reflects 80 % of the radiation incident on it. Calculate the enegry concentrated by the heater in 1 hour if the solar energy were delivered to it at the rate of 0.66 kW//m^2 .

A student constructed a box type solar cooker. He found that it did not work efficiently. What could this be due to ? Give any four possible mistakes in the construction and operation of the cooker. What maximum temperature can ordinarly be reached inside a solar cooker ?

What is the range of temperature which can be attained in a box type solar cooker in two to three hours exposure to sun?