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A ray of light incident normally on one of the faces of rt. Angled isosceles prism is found to be totally reflected, what is min. value of refractive index of material of prism ? |
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Answer» 1.01 Now `45^(@) ge C` (for glass air interface) `SIN 45^(@) ge sin C` or `(1)/(sqrt(2)) ge (1)/(mu) or mu ge sqrt(2)` `mu_(min) = sqrt(2_ = 1.414`  If r is angle of refraction in water, then `sqrt(2) sin 45^(@) = (4)/(3) sin r` or `r = 48.6^(@)` |
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