1. A plastic light pipe has an index of refraction of 1.41. For total internal r

Question

1. A plastic light pipe has an index of refraction of 1.41. For total internal reflection, what is theminimum angle of incidence if the pipe is in the following media? (a) air
1°

(b) water
2°
2. A layer of ice having parallel sides floats on water. Iflight is incident on the upper surface of the ice at an angle ofincidence of 35.0°, what is the angle of refraction in thewater?
1°
(a) air
1°

(b) water
2°
2. A layer of ice having parallel sides floats on water. Iflight is incident on the upper surface of the ice at an angle ofincidence of 35.0°, what is the angle of refraction in thewater?
1°

Explanation / Answer

we have index of refraction of plastic pipe is n1 =1.41 for total internal reflection to occur the minimum angle ofincidence is c called the critical angle. a) if the pipe is in air ( n2 = 1.0) we have from snell's law as      n1sinc = n2sin900 =n2         orsinc = n2/n1       or c =sin-1(n2/n1)               = --------------- b) if the pipe is in air ( n2 = 1.333) we have from snell's law as      n1sinc = n2sin900 =n2         orsinc = n2/n1       or c =sin-1(n2/n1)               = --------------- Note : please submit one question perone post . if the pipe is in air ( n2 = 1.333) we have from snell's law as      n1sinc = n2sin900 =n2         orsinc = n2/n1       or c =sin-1(n2/n1)               = --------------- Note : please submit one question perone post .

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