Spherical aberration in a thin lens can be reduced by(a) using a monochromatic light(b) using a doublet combination(c) using a circular annular mark over the lens(d) increasing the size of the lens
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answer : option (c) using a circular annular mark over the lens.
explanation : we know, spherical aberration is happened because of the marginal rays and the paraxial rays incident on a lens are brought to focus at different points.
To reduce spherical aberration, the marginal rays are blocked by using a circular annular mask over the lens.
hence, option (c) is correct.
explanation : we know, spherical aberration is happened because of the marginal rays and the paraxial rays incident on a lens are brought to focus at different points.
To reduce spherical aberration, the marginal rays are blocked by using a circular annular mask over the lens.
hence, option (c) is correct.
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Using a circular annular mark over the lens
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