defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Physics Optics Refraction and Reflection

A concave mirror of focal length f in air is dipped in a liquid of refractive index μ. Its focal length in the liquid will be : 

1
\(\frac{f}{\mu}\)
2
\(\frac{f}{(\mu-1)}\)
3
μf
4
f
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