If the critical angle for total internal

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Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

If the critical angle for total internal reflection from a medium to vacuum is 30°. Then the speed of light in the medium is?

Options:

3x10⁸ m/s

2x10⁸ m/s

1.75x10⁸ m/s

1.5x10⁸ m/s

Correct Answer:

1.5x10⁸ m/s

Explanation:

Refractive index μ = 1/sinθ_c

= 1/sin30 =2

Refractive index μ = c/v

v = 3x10⁸ / 2 = 1.5x10⁸ m/s