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Write the expression for R.I. of the mat...

Write the expression for R.I. of the material of the prism for symmetric refraction.

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`""_(1)n_(2)=(n_(2))/(n_(1))=(sin((A+D)/(2)))/(sin((A)/(2)))`
where, .A. - angle of the prism
.D. - angle of minimum deviation
`""_(1)n_(2)` - R.I. of medium (2) w.r.t medium (1)
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