why parabolic mirror is used in search light
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Why are mirrors used in search lights parabolic & not concave spherical ? ... In search lights , we need an intense parallel beam of light . If a source is placed at the focus of a concave spherical mirror , only paraxial rays are rendered parallel . Due to large aperture of mirror , marginal rays give a divergent beam
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becoz it emits a parallel sided, non converging beam tjat can still eluminate objecta a greater distance
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