If the critical Angle for total internal reflection from a medium 2 vacuum is 30 degree the velocity of light in the medium is?

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Solution

We should know Snell's law
n1 sin I = n2 sin r
for critical angle the value of r becomes 90 degree
n1 / n2 = sin 90 / sin 30 = 2
also
n1/n2 = v2/v1
2 = 3 * 10^8 / velocity in medium
v= 1.5 * 10^8

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If the critical Angle for total internal reflection from a medium 2 vacuum is 30 degree the velocity of light in the medium is?

We should know Snell's law n1 sin I = n2 sin r for critical angle the value of r becomes 90 degree n1 / n2 = sin 90 / sin 30 = 2 also n1/n2 = v2/v1 2 = 3 * 10^8 / velocity in medium v= 1.5 * 10^8

We should know Snell's law
n1 sin I = n2 sin r
for critical angle the value of r becomes 90 degree
n1 / n2 = sin 90 / sin 30 = 2
also
n1/n2 = v2/v1
2 = 3 * 10^8 / velocity in medium
v= 1.5 * 10^8