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A collimated Gaussian light beam is focused to a spot by a lens. The diameter (2w)...

A collimated Gaussian light beam is focused to a spot by a lens. The diameter (2w) of the input beam is 100 microns. What is the diameter of the waist (2wo) of the focused spot if the wavelength of the light is 1550 nm and the focal length of the lens is 1.5 mm?

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