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A beam of light having wavelength 5000 Å...

A beam of light having wavelength `5000 Å` is incident on a plane metallic surface. The intensity of the incident beam of light is `40 watt` and its cross-sectional area is `2mm^(2)`. What will be pressure (in `"dyne"//cm^(2)`) exerted by radiation on the metallic surface if `50%` of it is reflected back by metallic surface.

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