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Q.

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

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a

1.5×1013 W/m2

b

2.5×109 W/m2

c

3.5×1017 W/m2

d

None of these

answer is B.

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Detailed Solution

Area through which the energy of beam passes=6.328×10−72=4×10−13m2∴  I=PA=10−34×10−13=2.5×109W/m2
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