Unpolarised is incident from air on a plane surface of a material of refractive index `mu ` . At a particular angle of incidence I . It is found that the reflected and refracted rays are perpendicular to each other . Which of the following options is correct for this situation ?

Options

A. `I = sin ^(-1) ((1) /( mu ))`
B. Reflected light is polarised with its electtic vector perpendicular to the incidence
C. Reflected light is polarised with its electric vector parallel to the plane of incidence
D. `I = tan ^(-1) ((1) /( mu ))`