Laser light from a 7mW source of aperture diameter 1.5 cm and waveleng – McqOptions

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1.	Laser light from a 7mW source of aperture diameter 1.5 cm and wavelength 5000 Å is focused by a lens of focal length 10 cm. The intensity of the image is __________
A.	3 X 107 Wm-2
B.	4 X 107 Wm-2
C.	5 X 107 Wm-2
D.	6 X 107 Wm-2
Answer» D.

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