A monochromatic light is incident from air on a refracting surface of a prism of angle
75∘ and refractive index
n0=√3. The other refracting surface of the prism is coated by a film of material of refractive index
n as shown in figure. The ray of light suffers total internal reflection at the coated prism surface for an incidence angle of
θ≤60∘. The value of
10 n2 is
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1089655/original_13_qstn_%2814-4-21%29.png)