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Light with an energy flux of 18 W cm^(-2...

Light with an energy flux of `18 W cm^(-2)` falls on a non-reflecting surface at normal incidence. If the surface at normal incidence. If the surface has an area of `20 cm^(2)`, find the average force exerted on the surface during a span of 30 min.

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`1.2xx 10^(-6) N`
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