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A light beam of intensity 20 W cm is normally normally on a perfectly incident...

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A light beam of intensity 20 W cm is normally normally on a perfectly incident reflecting surface of sides 25 cm x 15 cm The momentum imparted to the surface by the light per second is A 1x 10 5 kg ms 1 B 5 x 10 5 kg ms 1 P 21 C 1 2 x 10 5 kg ms D 2 x 10 5 kg ms 2x20 7x10

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