Question

explain why does paper get burn when the sun light is focused on it with the help of convex lens

Answer 1

Here is your answer:

• When sun rays fall on the convex lens they get converged to a point.
• The rays if the Sun are almost parallel due to which the image will always be formed at the principal focus.
• Thus all the rays come together in the focus.
• These rays surely have heat energy and they get accumulated in that point.
• When the amount of rays have accumulated enough so as to reach the ignition temperature of paper, the paper catches fire.
• Thus the paper is burnt.

Hope it helps you

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Answer 2

because that lens is convex lens and convex lens converge light rays at a point so when we
sunlight is focous on a paper with help of a lens it burn.

mean ☞☞☞ As the raysconverge, the concentration ofsunlight at that point increases, thus producing heat. This heat starts a fire which eventually causes the paper toburn.