cse • paper_1 • waves_oscillationscse-2010-subject-02-010
Laser light — UPSC CSE 2010 Physics PYQ
Buy PYQ Solution Manual →A laser beam of 1 micrometer wavelength with 3 megawatts power of beam diameter 10\ \mathrm{mm} is focussed by a lens of focal length 50\ \mathrm{mm}. Evaluate the electric field associated with the light beam at the focal point. (Dielectric permittivity of free space, \varepsilon_0=8\cdot8542\times10^{-12}\ \mathrm{C^2/N-m^2})
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