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Question

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


A

1.5× 1013W/m2

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B

2.5× 109 W/m2

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C

3.5× 1017 W/m2

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D

None of these

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