Teaching AWES Army Public School TGT Mock Test 2024 Physics Optics Mirrors and Images

The focal length of a concave mirror is f in air. Its focal length in water (refractive index \(\dfrac{4}{3}\)) will be

1
f
2
\(\dfrac{3}{4}f\)
3
\(\dfrac{4}{3}f\)
4
\(\dfrac{7}{3}f\)
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