why are the mirrors used in solar devices ? / why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper ?
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When these rays fall on the concave mirror, they are converged to a single point on the focal plane of the mirror. Thus a lot of heat is produced at the point. Now, if a paper is placed at that point to get image of sun, the papers gets burnt because of huge amount of heat concentrated at that point.
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1.Concave mirrors are used in solar cookers. This is because they are the only type of mirrors that reflect sunlight to a single focal point. ... Concave mirrors absorb all the incident light and reflect it to a single focal point. This reflected light is very powerful because it carries a lot of thermal energy.
2. The rays from the sun are parallel. When these rays fall on the concave mirror, they are converged to a single point on the focal plane of the mirror. ... Now, if a paper is placed at that point to get image of sun, the papers gets burnt because of huge amount of heat concentrated at that point.
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