A radiation of energy 'E' falls normally on a perfectly reflecting surface

A radiation of energy ‘E’ falls normally on a perfectly reflecting surface

A radiation of energy ‘E’ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c= velocity of light)

(a) E/c
(b) 2E/c
(c) 2E/c²
(d) E/c²

2E/c

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