9, what is the incident angle 10. Assume that the completely polarized light ref

Question

9, what is the incident angle 10. Assume that the completely polarized light reflected from the liquid surface has the intensity of Io=100.0 w/m:" You are wearing a pair of sunglasses which is vertically polarized. When, with your sunglasses on, you try to see the light which is reflected from the surface, you will not be able to see the light.ie. the intensity of light after the sunglasses is zero. Now, if you put a polarizer (of which polarizing axis is 30 with respect to your sunglasses) in front of the sunglasses (meaning between th polarizing axis is 30 with respect to your sunglasses) in front of the sunglasses (meaning between the liquid surface and the sunglasses), what is the intensity of the light that you will see?

Explanation / Answer

(9) The angle at which unpolarized light become perfectly polaized on reflection is known as brewester angle and given as follows

therefore

p = 53.47
(10) We know that according to law Of malus

So on putting the polarizer at of angle 30 then Intensity after polarizer I1 = 75
But the sunglasses were vertically polarized therefore now it would be 60 degree polarized with respect to polarizer and the intensity after polarizer I = I1 (Cos60)2 = 18.75

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