Part A. For light of wavelength 589 nm, calculate the critical angles for the fo

Question

Part A.
For light of wavelength 589 nm, calculate the critical angles for the following substances when surrounded by water.
fluorite____ °
flint glass____ °
zircon_____ °

Part B.
A ray of light is incident on the surface of a block of clear ice at an angle of 54.0° with the normal. Part of the light is reflected and part is refracted. Find the angle between the reflected and refracted light.
________ °

Part C.
Find the speed of light in the following.
(a) fused quartz _____ m/s

(b) polystyrene _____m/s

Explanation / Answer

A) sinqc = n2/n1. For air, n2 = 1, so sinqc = 1/n1 (b) flint glass: n1 = 1.66, sinqc = 0.60, qc = 37.04o. similarly for other two b) Again, a straight application of Snell’s law: sin i / sin r = n2 / n1 ; sin 54 / sin r = 1.31 / 1 ; or r = 38.13 , with normal angle of reflection = 54 degrees ; angle beteween refrated and reflected ray = 180 - ( 54+38.13 ) = 87.87 degrrees

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