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A ray of light is incident on the left v...

A ray of light is incident on the left vertical face of glass cube of refractive index `n_2,` as shown in figure. The plane of incidence is the plane of the page, and the cube is surrounded by liquid (refractive index`=n_1`). What is the largest angle of incidence `theta_1` for which total internal reflection occurs at the top surfaces?

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