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?

Options

A. sin 1 = `sqrt(((mu_(2))/(mu_(1)))^(2)-1)`
B. sin 1 = `sqrt(((mu_(2))/(mu_(1)))^(2)+1)`
C. sin 1 = `sqrt(((mu_(1))/(mu_(2)))^(2)+1)`
D. sin 1 = `sqrt(((mu_(1))/(mu_(2)))^(2.)+1)`