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s Why does a paper catch fire if a concave mirror is used to focus sunlight?4 will it be easy to watch the activities of customers in a departmental store withWhy or why not?hy do objects waver when seen on a really hot day?mir |
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Answer» 3)You can burn paper by concave mirror because when ligt ray which comes from infinity after reflecting it converge in focus and then large amount of heat occur and it burns the paper but the paper should be kept in focus. 5)We observe randomwaveringor flickering of theobjectsnear a fire on avery hot daydue to atmospheric refraction. ... Refractive index of thehotairisslightly less than that of the cold air. Since, the densitydoesnot remain the same , the Apparent position of theobjectasseenthroughhotair ,fluctuates. thankx |
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