$A$ concave lens (refractive index $n_l = 1.5$) has both surfaces of the same radius of curvature $R$. If it is immersed in a liquid of refractive index $n_m = 1.75$,it will act as a:
- Aconcave lens of focal length $3.5 R$
- Bconcave lens of focal length $2 R$
- Cconvex lens of focal length $3.5 R$
- Dconvex lens of focal length $2 R$
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