First slide

Intensity of electromagnetic wave

Question

A laser beam can be focussed on an area equal to the square of its wavelength. A laser source radiates energy at the rate of 1mW and its wavelength is 632.8nm. The intensity of focussed beam will be

Easy

Solution

$I = \frac{P}{A} = \frac{P}{λ^{2}} = \frac{10^{- 3}}{{(6328 \times 10^{- 10})}^{2}} = 2 .5 \times 10^{9} w / m^{2}$

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