Two rays travelling parallel to the principal axis strike a large plano-convex lens having a refractive index of 1.60. If the convex face is spherical, a ray near the edge does not pass through the focal point (spherical aberration). If this face has a radius of curvature of 20.0 cm & the two rays are h 1 = 0.5 cm & h 2 = 12.0 cm from the principal axis, find the difference in the positions where they cross the principal axis –

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1.60 sin i = sin r
= sin r

in this way we can calculate PF for both rays and difference in position = PF 2 – PF 1
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