Question

# Figure A shows two identical plano-convex lenses in contact as shown.The combination has local length 24 cm.Figure B shows the same with a liquid introduced between them.If refractive index of glass of the lenses is 1.50 and that of the liquid is 1.60 ,  the focal length of the system in figure B will be

A

B

C

D

## 24 cm

Medium
Solution
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Correct option is A)

## Let radius of the convex side be .By lens makers' formula,So focal length of 2 identical plano-convex lens is given by, The total focal length of the lens combination can be given as,Option A is correct

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