how to remove spherical aberration?
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Answer:Spherical aberration can be minimized by using stops, which reduce the effective lens aperture. The stop used can be such as to permit either the axial rays of light or the marginal rays of light. However, as the amount of light passing through the lens is reduced, corresponding the image appears less bright.
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The simplest method of reducing spherical aberration is to place an aperture, hole or "stop", in front of or after the lens. The aperture blocks out rays that blur the image. The disadvantage is, however, a greatly reduced light throughput of the lens.
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