A light ray incident along 2i¯+4j¯+5k¯ strikes on x-z plane from medium 1 of refractive index 3 and enters in to medium 2 of refractive index μ2 . The value of μ2 for which the value of angle of refraction becomes 90o, is _____ (3=1.73)

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A light ray incident along $2 \bar{i} + 4 \bar{j} + \sqrt{5} \bar{k}$ strikes on x-z plane from medium 1 of refractive index $\sqrt{3}$ and enters in to medium 2 of refractive index $μ_{2}$ . The value of $μ_{2}$ for which the value of angle of refraction becomes $90^{o},$ is _____ $(\sqrt{3} = 1.73)$

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answer is 1.04.

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$\sin θ_{c} = \frac{μ_{2}}{μ_{1}}$

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