Teaching DSSSB TGT Mock Test 2025 Physics Optics Mirrors and Images

The focal length of a concave mirror is f in air. Its focal length in water (retractive index 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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