cse • paper_1 • waves_oscillations
[UPSC CSE 1994] Polarisation and Modern Optics (Q462, 20M)
The light (\lambda = 6000\text{\AA}) from a laser of sectional diameter 1.0 cm and power 0.02 watt is loosed by a lens of focal length 10 cm. Determine the area at the image and intensity in it in watt/cm^2.
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