Why does parabolic mirror not have Spherical aberration?
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Parabolic mirrors do not suffer from spherical aberration (spherical mirrors cannot focus all incoming, on-axis, light onto a point), nor chromatic aberration (single lens refracting telescopes focus light of different colors at different points).The parabolic mirrors will be achromatic across all wavelengths as the rays are focused by a mirror that has no chromatic aberration. We have been using a parabolic mirror for concentrating solar energy and have never observed chromatic aberration at its focal spot.
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