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A convax lens of glass ,refractive index...

A convax 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 wuill behaves as a
(A)convergent lens of focal length `3.5R`(B)convergent lens of focal length `3.0R`(C)divergent lens of focal length `3.5R`(D)divergent lens of focal length `3.0R`

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