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A ray of light travelling in a medium of refractive index mu is incident at an angle theta ona composite transparent plate consisting of 50 plates of R.I. 1.0mu, 1.02mu, 1.03mu,"……",1.50mu. The ray emerges from the composite plate into a medium of refractive index 1.6 mu at angle 'x'. Then

Answer»

`sin x (1.01/1.5)^(50) sin THETA`
`SINX = 5/8 sin theta`
`sinx= (8)/(5) sin theta`
`sinx = (1.5/1.01)^(50) sin theta`

Solution :
ACCORDINGTO SNELL's law, `musintheta= 1.6 mu sin x`
`:. sin x = 5/8 sin theta`


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