cse • paper_1 • waves_oscillations
[UPSC CSE 1997] Polarisation and Modern Optics (Q451, 20M)
A 3 MW laser beam which has a diameter of 1\text{ cm} is foccussed by a lens of focal length 5\text{ cm}. The wavelength of laser is 10,000\text{ \AA}. Calculate the intensity of the focal plane of the lens.
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