Light inside a glass block of refractive index 1.55 strikes a flat surface that is…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Light inside a glass block of refractive index 1.55 strikes a flat surface that is coated with a transparent layer. Rays may hit the interface at angles as large as 68∘ from the normal. Calculate the greatest refractive index the coating can have if all such rays are to remain totally internally reflected.