Which of the following parts of the solar cooker is responsible for greenhouse effect ?

The correct option is Glass sheet.

Explanation:

A solar cooker is a device that uses direct sunlight to heat, cook, or pasteurize drink and other food materials.

1. Glass Sheet: The transparent glass cover allows short-wavelength solar radiation (visible light and infrared rays) to enter the insulated box. Once inside, the surfaces absorb these rays and re-emit heat energy as long-wavelength infrared radiation. The glass sheet traps this long-wavelength radiation inside because it is opaque to longer thermal radiation. This trapping of heat creates a greenhouse effect, raising the inner temperature of the solar cooker significantly.

2. Mirror: Used as a reflector to direct and focus additional sunlight onto the solar cooker box to increase the intensity of solar radiation entering it.

3. Black Coloured Coating: Absorbs maximum sunlight entering the box, as black surfaces are good absorbers of thermal radiation, helping to convert light into heat.

Therefore, the Glass sheet is specifically responsible for producing the greenhouse effect inside the solar cooker.