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Q.

A beam of light of intensity 12 watt /cm2 is incident on a totally reflecting plane mirror of area 1.5 cm2, then the force acting on the mirror is p×10−7N. Find the value of p.

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Detailed Solution

Pressure of light on totally reflecting surfaceP=2IC (C= velocity of light ) P=FA=2IC ⇒F=2IAC=2×12×1.5×10−410−4×3×108 =8×15×10−810=12×10−8=1.2×10−7N

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