A beam of light with intensity 10^-3 Nm^-2 and cross sectional area 20 cm^2 is incident on a fully reflective surface at angle 45^ . Then the force exerted by the beam on the surface is

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Correct answer: D. (d) For completely reflecting surface, where light falls at ^ . ( P t )= 2 IAC cos ⁡ ⇒F= 2 10^-3 20 10^-43 10^8 1 2 ⇒F=9.4 10^-15N

$A beam of light with intensity 10^{- 3} Nm^{- 2} and cross sectional area 20 cm^{2} is incident on a fully reflective surface at angle 45^{\circ} . Then the force exerted by the beam on the surface is$

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