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 3.5R (B) Convergent lens of focal length 3R (C) Divergent lens of focal length 3.5R (D) Divergent lens of focal length 3R

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