Laser light from a 2mW source of aperture diameter 1.5 cm and wavelen – McqOptions

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1.	Laser light from a 2mW source of aperture diameter 1.5 cm and wavelength 5000 Å is focused by a lens of focal length 20 cm. The intensity of the image is __________
A.	1.57 X 106 Wm-2
B.	2.57 X 106 Wm-2
C.	3.57 X 106 Wm-2
D.	4.57 X 106 Wm-2
Answer» D. 4.57 X 106 Wm-2

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