Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Physics Optics Refraction and Reflection
If a lens of glass of refractive index 3/2, has a focal length fa in air. Lens is shifted from air to water (μ = 4/3), then focal length of lens in water becomes fw. The relation between fw and fa s -
1
fw = 2fa
2
fw = 4fa
3
fw = fa/4
4
More than one of the above
5
None of the above