A ray of monochromatic light is incident on one refracting face of a prism of angle 75^@. IT passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is sqrt2, the angle of incidence on the first face of the prism is

A ray of monochromatic light is incident on one refracting face of a p

1.	A ray of monochromatic light is incident on one refracting face of a prism of angle 75^@. IT passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is sqrt2, the angle of incidence on the first face of the prism is
Answer» `30^@` `45^@` `60^@` `0^@` ANSWER :B