If the critical angle for total internal reflection from a medium to vacuum is 45°, then the velocity of light in the medium is:
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If the critical angle for total internal reflection from a medium to vacuum is 45°, then the velocity of light in the medium is:

G1 Physics · Accepted Answer

Step 1: sin C = 1/μ = v/c. Step 2: With C = 45°, v = c sin 45°. Step 3: v = (3 × 10⁸)/√2 m/s. Final answer: (B) (3/√2) × 10⁸ m/s.