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Amit Saxena Grade: upto college level
`        A beam of white light is incident normally on a plane surface absorbing 70% of the light and reflecting the rest. If the incident beam carries 10 W of power, find the force exerted by it on the surface.`
3 years ago

Deepak Patra
474 Points
```										Sol. Power 10 W P →Momentum
λ = h/c or, h/λ or,P/t = hh/λt
R = hc/λ or, E/t = hc/λt = Power (W)
W = Pc/t or, P/t = W/c = force.
or Force = 7/10 (absorbed) + 2 * 3/10 (reflected)
= 7/10 * W/C + 2 * 3/10 * W/C ⇒ 7/10* 10/3 * 10^8 + 2 * 3/10 * 10^3 * 10^8

```
3 years ago
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