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  • A beam of white light in incident on a plane surface absorbing 70 % of the light and reflecting the rest. If the incident beam carries now of power, the force exerted by it on the surface- &

A beam of white light in incident on a plane surface absorbing 70 % of the light and reflecting the rest. If the incident beam carries now of power, the force exerted by it on the surface-
 

Option: 1

2.5 \times 10^{-9} \mathrm{~N}


Option: 2

3 \times 10^{-8} \mathrm{~N}


Option: 3

4.3 \times 10^{-8} \mathrm{~N}


Option: 4

2 \times 10^{-5} \mathrm{~N}


Answers (1)

best_answer

\begin{aligned} &\mathrm{using, f=\frac{(1+r) \text { power }}{c}, here}\\ &\mathrm{ \gamma=0.3 }\\ &\mathrm{ \therefore \quad F=\frac{1.3 \text { power }}{c} \Rightarrow \frac{1.3 \times 10}{3 \times 10^8} }\\ &\mathrm{ F=4.3 \times 10^{-8} \mathrm{~N} }\\ \end{aligned}

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Rishabh

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