Mirror on which sun rays are falling is moved in such a way that asap and bright spot of light is formed on a paper the concave mirror and the paper are kept in their places for a few minutes then what do you observe explain the reason of your observation?

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Answer: The paper will start working after sometime. This is because the sunlight contains heat radiation. When these heat radiation are concentrated at a point on the paper, the temperature of the paper increases due to the observation of heat radiation. Hence, the paper starts burning when the temperature of the paper is more than its ignition temperature.

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Mirror on which sun rays are falling is moved in such a way that asap and bright spot of light is formed on a paper the concave mirror and the paper are kept in their places for a few minutes then what do you observe explain the reason of your observation? ​

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Mirror on which sun rays are falling is moved in such a way that asap and bright spot of light is formed on a paper the concave mirror and the paper are kept in their places for a few minutes then what do you observe explain the reason of your observation?