A pane of glass, n_9lass = 1.5, is in air. Light of a certain intensity strikes

Question

A pane of glass, n_9lass = 1.5, is in air. Light of a certain intensity strikes the pane at normal incidence; some of the light is reflected from the front surface, some of the light goes through the glass itself and is reflected from the back surface. Assume no secondary reflections. What percentage of the original light is reflected from the front surface? What percentage of the original light is reflected from the back surface? What percentage of the original light is transmitted all the way through the pane?

Explanation / Answer

a)    From , front surface   original light reflected = (n2 - n1)2/(n2 + n1)2

                                                                                                                 =   (1.5 - 1)2/(1.5 + 1)2

                                                                                                                = 0.04

=>   percentage of front surface   original light reflected =   4 %

b)     percentage of back surface   original light reflected    =    (0.04 * 0.96) * 100

                                                                                               = 3.84 %

c)     percentage of    original light transmitted through the pane =   92.16 %

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