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A light ray is incident normal to one face of a triangular block and strikes point P on
the other side. The block is made of material with index of refraction of 1.71. The
block is immersed in oil, having index of refraction of 1.10. What is the maximum
angle y for which total internal reflection occurs at P?
P
O Not possible to have total reflection at P.
O 30°
O 60°
O 50°
O 40°
O 45°

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