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  • A beam of white light in incident on a plane surface absorbing70% of the light and reflecting the rest. If the incident beam carries10 w of power, the force exerted by it on the surface-<div cl

A beam of white light in incident on a plane surface absorbing70% of the light and reflecting the rest. If the incident beam carries10 w of power, the force exerted by it on the surface-

Option: 1

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


Option: 2

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


Option: 3

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


Option: 4

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


Answers (1)

best_answer

\mathrm{ \text { using, } \begin{aligned} f & =\frac{(1+r) \text { power }}{c}, \text { here } \\ r & =0.3 \\ \therefore \quad f & =\frac{1.3 \text { power }}{c} \Rightarrow \frac{1.3 \times 10}{3 \times 10^3} \\ f & =4.3 \times 10^{-5} \mathrm{~N} \text { Ans. } \end{aligned} }

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Riya

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