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 :                       

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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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