When the heat rays from the sun area focused on a piece of black cloth by means

When the heat rays from the sun area focused on a piece of
black cloth by means of a lens, the cloth catches fire. Why ?

Question Posted / guest

When the heat rays from the sun area focused on a piece of black cloth by means of a lens, the clot..

Answer / guest

It is because the heat radiations obey the laws of refraction.

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