A ray of light strikes a glass plate at an angle of `40^(@)`. If the reflected and refracted rays are perpendicular to each other the index of refractive of glass is

A ray of light strikes a glass plate at an angle of 60^@ . If the reflected and refracted rays are perpendicular to each other, the index of refraction of glass is

A ray of light strikes a glass plate at an angle of 60^(@) . If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is

A ray of light strikes a glass plate at an angle 60^@ . If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is,

A ray of lght strikes a glass plate at an angle of incidence 57^@ .If the reflected and refracted rays are perpendicular to each other,find the refractive index of glass.