Two polaroids are placed with their optiic axis perpendicular to each other. One of them is rotated through 45 degrees then what is the intensity of light emerging from the second polaroid if Io is the intensity of the unpolarised light?
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From Malus Law,
I = I0 Cos^2(α)
Now α=45 degree
And after passing through first Polaroid the intensity becomes half I. e. I0/2
So, I = I0/2 Cos^2(45)
I = I0/4
I. e. intensity is one-fourth of the incident unpolarised light..
I = I0 Cos^2(α)
Now α=45 degree
And after passing through first Polaroid the intensity becomes half I. e. I0/2
So, I = I0/2 Cos^2(45)
I = I0/4
I. e. intensity is one-fourth of the incident unpolarised light..
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