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Standard XII
Physics
Question

The effective focal length of the lens combination shown in the figure is 60 cm. The radii of curvature of the curved surfaces of the plano-convex lenses are 12cm each and the refractive index of the material of the lens is 1.5. The refractive index of the liquid is :
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  1. 1.33
  2. 1.42
  3. 1.53
  4. 1.60

A
1.60
B
1.33
C
1.42
D
1.53
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