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Two equi-convex lenses, each of radius o...

Two equi-convex lenses, each of radius of curvature 20 cm and refractive index 1.5 are placed in contact. If water of refractive index `4/3`is placed in between the lenses, the focal length of the combination is,

A

15cm, convex

B

15cm,concave

C

7.5cm, convex

D

7.5cm, concave

Text Solution

Verified by Experts

The correct Answer is:
C
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