A beam of light of intensity I is normally incident on a plate of area A . If plate absorbs fraction η of incident light and reflects rest of it back, then the force exerted by the incident light on the plate is given by [ c =speed of light]

Question

A beam of light of intensity I is normally incident on a plate of area A . If plate absorbs fraction η of incident light and reflects rest of it back, then the force exerted by the incident light on the plate is given by [ c =speed of light], IA c 1 - η, IA c η + 1, IA c 2 η - 1, IA c 2 - η

MARKS App · Accepted Answer

Force exerted by the fraction of ,ight that is absorbed is given as, F 1 = ηIA c . Force exerted by the fraction of light that is totally reflected is given as, F 2 = 1 - η × 2 IA c . Hence, total force will be given as, F = F 1 + F 2 = 2 - η IA c .

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