Questions
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
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Correct option is B
Area through which the energy of beam passes=6.328×10−72=4×10−13m2∴ I=PA=10−34×10−13=2.5×109W/m2Similar Questions
Ratio of intensities of two waves are given by 4 : 1' Then the ratio of the amplitudes of the two waves is
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