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Light with an energy flux of 25xx10^4 W...

Light with an energy flux of `25xx10^4 Wm^-2` falls on a perfectly reflecting surface at normal incidenc .If the surface area `15cm^2` ,the average force exerted on the surface is

A

`1.25xx10^-6N`

B

`2.50xx 10^-6 N`

C

`1.20xx10^-6 N`

D

`3.0xx10^-6 N`

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