Laser light from a 2mW source of aperture diameter 1.5 cm and wavelength 5000 is focused by a lens of focal length 20 cm. The intensity of the image is __________

Laser light from a 2mW source of aperture diameter 1.5 cm and waveleng

1.	Laser light from a 2mW source of aperture diameter 1.5 cm and wavelength 5000 is focused by a lens of focal length 20 cm. The intensity of the image is __________
A.	1.57 X 10<sup>6</sup> Wm<sup>-2</sup>
B.	2.57 X 10<sup>6</sup> Wm<sup>-2</sup>
C.	3.57 X 10<sup>6</sup> Wm<sup>-2</sup>
D.	4.57 X 10<sup>6</sup> Wm<sup>-2</sup>
Answer» D. 4.57 X 10<sup>6</sup> Wm<sup>-2</sup>