A laser beam can be focussed on an area equal to the square of its wavelength A He-Ne laser radiates energy at the rate of 1mW and its wavelength is 632.8 nm. The intensity of focussed beam will be?
Added by Shirlin S.
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Given that the area is equal to the square of the wavelength, we have: Area = (632.8 nm)^2 = (632.8 x 10^-9 m)^2 = 4.001984 x 10^-13 m^2 Show more…
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