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Light is incident normally on the face AB of a prism as shown in figure. A liquid of refractive index n is placed on face AC of the prism. The prism is made of glass of refractive index sqrt3. The limiton n for which total internal reflection takes place on face AC is ........... |
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Answer» `n gt sqrt3`  Refractive index of PRISM RELATIVE to LIQUID is `n_p=("nprism")/("nliquid")=(sqrt3)/(n)` …(1) `SIN c=(1)/(""^ln_p)=(n)/(sqrt3)` …(3) For total internal reflection i `gt` c sin i `gt` sin c `therefore sin 60 gt (n)/(sqrt3)` `therefore(sqrt3)/(2)=(n)/(sqrt3)""therefore n lt 3/2` |
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