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Ray Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
MCQ
If the critical angle for total internal reflection from a medium to vacuum is $30^\circ ,$ the velocity of light in the medium is
  • A
    $3 \times 10^8 \mathrm{~m} / \mathrm{s}$
  • ✓
    $1.5 \times 10^8 \mathrm{~m} / \mathrm{s}$
  • C
    $6 \times 10^8 \mathrm{~m} / \mathrm{s}$
  • D
    $\sqrt{3} \times 10^8 \mathrm{~m} / \mathrm{s}$
✓

Answer

Correct option: B.
$1.5 \times 10^8 \mathrm{~m} / \mathrm{s}$
$1.5 \times 10^8 \mathrm{~m} / \mathrm{s}$

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