As shown in figure, a light ray is incident normal to on one face of a 30°€“60°€“90° block of dense flint glass (a prism) that is immersed in water.
(a) Determine the exit angle θ4 of the ray.
(b) A substance is dissolved in the water to increase the index of refraction. At what value of n2 does total internal reflection cease at pointP?

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