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A glass plate has a thickness t and refr...

A glass plate has a thickness t and refravtive index `mu` A light ray is allowed to incident in the plate from air. Find at what angle of incidence will the rays refracted and reflected by the plate be perpendicular to each other ? For this angle of incidence, calculate the lateral displacement of the ray
`(t(mu^(2)-1))/(musqrt(1+mu^(2)))`

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