Que 1st and 2nd with explanation.
1. A ray incident at point B at an angle of incidence enters into a glass sphere and is reflected and refracted at the farther surface of the sphere, as shown. The angle between the reflected and refracted rays at this surface is 90 . If refractive index of material of sphere is the value of is
2. Light in incident from glass to water . Find the range of deviation for which there are two angle of incidence.