Optics 3 Question 19

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

(2002,2M) (a)

(c)

(b) R

(d)

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Answer:

Correct Answer: 19. (c)

Solution:

  1. 1f=(μ1)1R11R2

For no dispersion, d1f=0

or

R1=R2



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