Why are mirrors used in search lights parabolic and not concave spherical??
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in search lights we need an intense parallel beam of light.if a source is placed at the focus of concave sperical mirror only paraxial rays are rendered parallel.due to large apeture of mirrors ,marginal rays give a divergent beam.
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Parabolic mirror is free from the spherical aberration. It reflects the rays parallely when source is kept at the focus. So that the object located at far distance can be visualized clearly. However, the concave mirror is suffered with spherical aberration, so it cannot reflect the light parallely that falls on its surface which fails to visualize distant object clearly.
Explanation:
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