JEE Advanced 2019 Paper 2

A monochromatic light is incident from air on a refracting surface of a prism of angle 75° and refractive index n0=√3 other refracting surface of the prism is coated by a thin film of material of refractive index n as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of θ≤60°The value of n2 is