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  4. A triangular prism of glass is inside water. A ray, inciden normally, on one of the faces, is totally reflected from face B C. Then the minimum refractive index of glass is -

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Q. A triangular prism of glass is inside water. A ray, inciden normally, on one of the faces, is totally reflected from face $B C$. Then the minimum refractive index of glass is -Physics Question Image

Ray Optics and Optical Instruments

Solution:

$ \text { For T.I.R. } 45^{\circ}>C $
$\therefore \sin 45^{\circ}>\sin C $
$\therefore \frac{1}{\sqrt{2}}>\frac{4 / 3}{n} $
$\therefore n>\frac{4 \sqrt{2}}{3}$
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