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Standard XII

Physics

TIR

If the critic...

Question

If the critical angle for total internal reflection from a medium to vacuum is $30^{0}$ , the velocity of light in the medium is.

3 \times 10^{8} m / s

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1.5 \times 10^{8} m / s

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6 \times 10^{8} m / s

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

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Solution

The correct option is D $1.5 \times 10^{8} m / s$
As we know,
$μ = \frac{1}{s i n C} = \frac{1}{s i n 30} = 2$
$∴ v = \frac{3 \times 10^{8}}{2} = 1.5 \times 10^{8} m / s$

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If the critical angle for total internal reflection from a medium to vacuum is 300, the velocity of light in the medium is.

The correct option is D 1.5×108m/sAs we know,μ=1sinC=1sin30=2∴v=3×1082=1.5×108m/s

If the critical angle for total internal reflection from a medium to vacuum is $30^{0}$ , the velocity of light in the medium is.

The correct option is D $1.5 \times 10^{8} m / s$
As we know,
$μ = \frac{1}{s i n C} = \frac{1}{s i n 30} = 2$
$∴ v = \frac{3 \times 10^{8}}{2} = 1.5 \times 10^{8} m / s$