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Why are solar cookers covered by a glass plate?

 Greenhouse effect:  This effect results in the heating of enclosed spaces into which the sun shines through a transparent material such as glass or plastic. Visible light easily passes through the glass and is absorbed and reflected by materials within the enclosed space. 

The light energy that is absorbed by dark pots and the dark absorber plate underneath the pots is converted into longer wavelength heat energy and radiates from the interior materials. Most of this radiant energy, because it is of a longer wavelength, cannot pass back out through the glass and is therefore trapped within the enclosed space.

 
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When sunlight falls over the solar cooker top, the sun rays pass through the glass sheet cover and get absorbed inside the cooker box.
This glass sheet covers does not allow the solar energy to flow out in the form of radiant heat.Thus it traps more and more heat rays of the sun thereby producing green house effect.That is why glass lid is used in the solar cooker.
 
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Glass covers function to trap the heta radiations inside the box.
Heat radiations once inside the box, will be absorbed by the content inside the box. The same radiations are reradiated in longer wavelengths, which fail to get refracted out of the glass cover.
 
Subsqeuently, the heat radiations get trapped inside the box & hence the temperature rise inside the box.
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Glasstransmits visible light but blocksinfraredthermal radiation from escaping. This amplifies the heat trapping effect.

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glass
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glass slab also blocks the entry of air from outside of solar cooker. it also helps to maintain high temperature inside the cooker.
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the glass plate is used to create green house effect because of which the heat which comes inside the solar cooker does not go out and helps in cooking the food 
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Glass covers function to trap the heta radiations inside the box... The same radiations are reraritated in longer wavelengths, which fail to get refract out of the Glass Cover. Subsequently, the heat radiations are trapped inside the box, and hence the radiations trapped inside the box.
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The glass plate covering helps covering helps in retention of heat inside the solar cooker on account of greenhouse effect . As a result, inside temperature is higher and maintained constant.
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because when the glass was not coverd the rays pass through the glass, that's why we covered by a glass.
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To converse the ray of light.to trapped a sunlight in solar cooker
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The glass plate allows solar radiation to pass through it but the heat radiation from inside are not allowed to escape by the glass plate. This it helps in maintaining the temperature inside solar cooker high.
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I think this will help you friends .....

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I think this will help you friends .....

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use of Glass plate because it allows shorter infrared radiations to pass through it but doesn't allow the longer wavelength infrared radiations to through it that results in increase in temperature
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It traps the heat of the sun and does not allow it to escape.this is similar to the green house effect of the earth
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To reduce loss of heat by radiation.
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Solar means driven by sun-given energy or obtained from sunlight.
It needs to pass through a transparent surface.It can't pass through opaque or fully-translucent.
Glass, being a good transparent surface allows light energy to pass through it and thus, help in the functioning of the solar cookers.
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The sun rays pass through the glass sheet cover and get absorbed inside the cooker box. It traps more and more heat rays of the sun, thus it is helpful in heating the food item.So the box of a solar cooker covered with a glass plate.

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when solar cooker falls on the glass the black colour absorbs more heat and within 5 or 10 minutes it will cook
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To produce a green house effect .
CO2 trapped in glass chamber produces heat through green house effect and hence help in making solar cooker more hot.
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When sunlight passes through the glass and hits the black coloured surfaces, the radiation is turned into heat, and the black surface also radiates out some of the energy, but it is in the infrared range. This infrared radiation cannot escape from the glass, so it continues to keep bouncing around, trapped.
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They are done so that the radiant heat doesn't flow out and traps more and more heat energy
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It produces similar condition to that of green house effect
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For trapping heat!
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the box of a?solar cooker covered?with a?glass plate.?glass?does allow the captured heat to go out and hence provide a greenhouse effect..?Solar cookers?are?covered?with a?glass plates?in order to capture heat. ... Just like the green house effect, the?glass plate?does not allow the heat to escape.
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the box of a solar cooker with a?glass plate.?Glass?does allow the captured heat to go out and hence provide a greenhouse effect..?Solar cookers are?covered with a?glass plates?in order to capture heat. ... Just like the green house effect, the?glass plate does not allow the heat to escape.
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So that the sun's heat Ray's paas though the glass sheet cover and get absorbed by the black inside surface of the cooker box
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To observe heat and to supply heat towards cookers so they can be cooked easily
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