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

Question

A pane of glass, n_glass = 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 pain?

Explanation / Answer

a) Percentage of light reflected from first surface= ( 1-1.5/ 1+1.5)^2 = 4%

b) Percenrage of light reflected from the back surface= { 1- [ 1-1.5/1+1.5 ]^2} { 1.5 - 1/ 1.5+1)^2 = 3.84 % apprx

C) Percentage of light transmittecd= { 1- [ 1-1.5/1+1.5 ]^2} { 1- [ 1.5 - 1/1+1.5]^2} = 92% apprx

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