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Light Energy — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSLight Energy1 Mark
Question
Why does a paper catch fire if a concave mirror is used to focus sunlight?
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Answer

A paper catches fire if a concave mirror is used to focus sunlight because concave mirror converges the parallel beam of light from the sun onto the paper. The large amount of heat getting concentrated on the paper raises its temperature, causing it to bum.

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