Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 Physics Optics Refraction and Reflection

If the critical angle for total internal reflection from a medium to vacuum is 30°. The velocity of light in the medium is-

1
3 × 108 m/s
2
1.5 × 108 m/s
3
6 × 108 m/s
4
\(\sqrt 3\) × 108 m/s
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