A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light. Where are the lens and mirror positioned?
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A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light. Where are the lens and mirror positioned?
A dentist uses a concave mirror to send light into his patients' mouths. If a parallel beam of light supplied by a lamp is to be concentrated at a distance 2.5 cm from the mirror, what should be the radius of curvature? O 1.25 cm O (1/2.5) cm 5.0 cm O 2.5 cm