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A concave lens of glass, refractive inde...

A concave lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a

A

convergent lens of focal length 3.5 R

B

convergent lens of focal length 3R

C

divergent lens of focal length 3.5 R

D

divergent lens of focal length 3R.

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The correct Answer is:
A
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