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A parallel beam of light of intensity I ...

A parallel beam of light of intensity I is incident on a glass plate. `25%` of light is reflected in any reflection by upper surface and `50%` of light is reflected by any reflection from lower surface. Rest is refracted The ratio of maximum to minimum intensity in interference region of reflected rays is

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`I_(1)= Ixx (25)/(100)= (I)/(4)`
The intensity of transmitted light is `I.= I-(I)/(4)= (3I)/(4)`
The intensity of light reflected fro lower surface is
`I_(2)= (3I)/(4)xx(50)/(100)= (3I)/(8)`
`(I"max")/(I"min")= ((sqrt(I_1)+sqrt(I_2))/(sqrt(I_1)+sqrt(I_2)))^(2)= ((sqrt(I/4)+sqrt((3I)/(8)))^2)/((sqrt(I/4)-sqrt((3I)/(8)))^2)=(((1)/(2)+sqrt((3)/(8)))^2)/((1)/(2)-sqrt((3)/(8)))^(2)`.
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