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Which one of the following sperical lens...

Which one of the following sperical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.
`R_(1)!=R_(2)`

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
C
`(1)/(f) = (mu -1) ((1)/(R_(1)) - (1)/(R_(2)))`
For no dispersion
`d{(1)/(f)} = 0 implies "d"mu{(1)/(R_(1)) - (1)/(R_(2))} = 0 implies R_(1) = R_(2)`
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