SATHEE: Optics Question 965

Optics Question 965

Question: If the critical angle for total internal reflection from a medium to vacuum is $30^{\circ}$ , the velocity of light in the medium is

[CPMT 1972; MH CET 2000; KCET 2000; BCECE 2003; RPMT 2003]

Options:

A) $3 \times 10^{8}$ m/s

B) $1.5 \times 10^{8}$ m/s

C) $6 \times 10^{8}$ m/s

D) $\sqrt{3} \times 10^{8}$ m/s

Show Answer

Answer:

Correct Answer: B

Solution:

$μ = \frac{1}{\sin C} = \frac{1}{\sin 30} = 2$

$∴ v = \frac{3 \times 10^{8}}{2} = 1.5 \times 10^{8} m / s$

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Optics Question 965

Question: If the critical angle for total internal reflection from a medium to vacuum is 30∘ , the velocity of light in the medium is

Options:

Answer:

Solution:

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Question: If the critical angle for total internal reflection from a medium to vacuum is $30^{\circ}$ , the velocity of light in the medium is