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A ray of light travelling in a medium of...

A ray of light travelling in a medium of refractive index `mu` is incident at an angle `theta` on a composite transparent plate consisting of 50 plates of `R.I 1.01 mu, 1.02 mu , 1.03 mu ……… , 1.50 mu` . The ray emerges from the composite plate into a medium of refractive index `1.6 mu` at angle 'x' . Then :

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