Hold the concave mirror with a paper in front of it at the focus of the mirror for 2 minutes.

Q15. Hold the concave mirror with a paper in front of it at the focus of the mirror for 2 minutes. What do you observe explain your observation?
Ans. The paper at first begins to burn producing smoke.
Eventually it may even catch fire.
This is because, the light from the Sun is converged at a point as a sharp bright spot by the mirror, at this point the heat produced due to the concentration of sun light is maximum which causes the paper to catch fire.

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