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[" Light with an energy flux of "25times...

[" Light with an energy flux of "25times10^(4)Wm^(-2)" falls "],[" on a perfectly reflecting surface at normal "],[" incidence.If the surface area is "15cm^(2)" ,the "],[" average force exerted on the surface is "],[[" (a) "1.25times10^(-6)N," (b) "2.50times10^(-6)N],[" (c) "1.20times10^(-6)N," (d) "3.0times10^(-6)N]]

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