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Which one of the following spherical lenses do not exhibit dispersion? The radii of curvatures of the surfaces of the lenses are as given in the diagrams.

Correct answer

2

Step-by-step solution

1 f = μ - 1 1 R 1 - 1 R 2 For no dispersion d 1 f = 0 d μ - 1 1 R 1 - 1 R 2 = 0 ⇒ R 1 = R 2

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