defence exam Navy SSR (Medical) Mock Test Series 2025 Physics Optics Refraction and Reflection

There is an equiconvex glass lens with radius of each face as \(R\) and \(_a\mu_{g}=3/2\) and \(_a\mu_w =4/3\). If there is water in object space and air in image space, then the focal length is

1
\(2R\)
2
\(R\)
3
\(3R/2\)
4
\(R^2\)
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