Why don't we use parabolic mirrors as they have a perfect focus instead of using spherical mirrors ?
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The Spherical mirror does not have a true optical axis, but if we drew a line from the center of the mirror, we would notice that light rays are not all focussed to one point, rather the light will focus at different points. This is called spherical aberration and its effect may be significant for smaller focal ratio's (< f/7), distracting for medium focal ratio's (f/8 - f/9) and negligible for longer focal ratios. A Parabolic mirror does not have this particular problem although off axis aberrations will be its bugbear (albeit these are correctable with specially designed lenses that slip into the focusser)
I hope it helps you
The Spherical mirror does not have a true optical axis, but if we drew a line from the center of the mirror, we would notice that light rays are not all focussed to one point, rather the light will focus at different points. This is called spherical aberration and its effect may be significant for smaller focal ratio's (< f/7), distracting for medium focal ratio's (f/8 - f/9) and negligible for longer focal ratios. A Parabolic mirror does not have this particular problem although off axis aberrations will be its bugbear (albeit these are correctable with specially designed lenses that slip into the focusser)
I hope it helps you
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