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A drop of liquid is spread on the hypotenuse of $$30^o -60^o -90^o$$ prism as shown and a ray of light incident normally on face $$AB$$ of the prism. If the refractive index of liquid is $$1.3$$, then the refractive index of prism, so that total internal reflection take place is :

A

$$1.2$$

B

$$1.4$$

C

$$1.5$$

D

$$1.3$$

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Solution

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Correct option is D. $$1.5$$

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