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Figure.. Shows a triangular prism of ref...

Figure.. Shows a triangular prism of refracting angle `90^(@)` . A ray of light incident at face AB at an angle `theta _(1)`, refracts at point Q with an angle of refraction `90^(@)`.
a. What is the regractive index of the prism in terms of `theta_(1)`?
b. What is the maximum value that the refractive inde can have?
c. What happens to the light at Q if the incident angle at Q is (i) increased slightly, and (ii) decrease slightly?

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