Question

# The effective focal length of the lens combination shown in the figure is cm.  The radii of curvature of the curved surfaces of the plano-convex lenses are each and the refractive index of the material of the lens is The refractive index of the liquid is :

A
B
C
D
Medium
Solution
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Correct option is D)

## We use the lens formula for a combination of lenses, Where, Substituting the values of  , and   We get

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