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NEET · Physics · STD 12 - 9. Ray optics and optical instruments
If the critical angle for total internal reflection from a medium to vacuum is \(45^{\circ}\), then velocity of light in the medium is,
- A \(3 \times 10^{8} \;m / s\)
- B \(1.5 \times 10^{8} \;m / s\)
- C \(\frac{3}{\sqrt{2}} \times 10^{8}\; m / s\)
- D \(\sqrt{2} \times 10^{8} \;m / s\)
Answer & Solution
Correct Answer
(C) \(\frac{3}{\sqrt{2}} \times 10^{8}\; m / s\)
Step-by-step Solution
Detailed explanation
\(\sin C =\frac{1}{\mu}\) \(\sin 45^{\circ}=\frac{1}{\mu}\)
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