Geometrical OpticsHard
Question
Spherical aberration in a thin lense can be reduced by
Options
A.using a monochromatic light
B.using a doublet combination
C.using a circular annular mark over lens
D.increasing the size of the lense
Solution
Spherical aberration is caused due to spherical nature o f lens. Paraxial and marginal rays are focused at different places on the axis of the lens. Therefore, image so formed is blurred. This aberration can be reduced by either stopping paraxial rays or marginal rays, which can be done by using a circular annular mark over the lens.
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