A proposed star wars antimissile laser is to focus infrared light with 2.8m wavelength to a 50-cm-diameter
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A proposed “star wars” antimissile laser is to focus infrared light with 2.8μm wavelength to a 50-cm-diameter spot on a missile 2500 km distant. Find the minimum diameter for a concave mirror that can achieve this spot size, given the diffraction limit. (Your answer suggests one of many technical difficulties faced by antimissile defense systems.)
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