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History of Snell's Law

Critical angl...

Question

Critical angle for light moving from nedium 1 to medium 2 is theta. The speed of light in medium 1 is v. The speed in medium 2 is-
a. v(1-cos theta)
b. v/sin theta
c. v/cos theta
d. v(1-sin theta)

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Solution

Sin theta = n2/n1 = V1/ V2
Or
Sin theta = V /V2
So ,
V2 = V / sin theta

Option (b)

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