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Two lenses having f(1):f(2)=2:3 has comb...

Two lenses having `f_(1):f_(2)=2:3` has combination to make no dispersion. Find the ratio of dispersive power of glasses used

A

`2 : 3`

B

`3 : 2`

C

`4 : 9`

D

`9 : 4`

Text Solution

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The correct Answer is:
a
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