JEE Main & Advanced
Physics
Ray Optics
Question Bank
Numerical Value Type Questions - Refraction at Plane Surface
question_answer
Two optical media have a plane boundary between them. Suppose \[{{\theta }_{icr}}\]is the critical angle of incidence of a beam and \[{{\theta }_{1}}\]is the angle of incidence at which the refracted beam is perpendicular to the reflected one (the beam is assumed to come from an optically denser medium). The relative refractive index of these media if \[\sin {{\theta }_{icr}}/sin{{\theta }_{1}}=\eta =1.28\]is\[0.25\times a\], then value of a is?