A ray of light from a denser medium strikes a rarer medium. The reflected and refracted rays make an angle of 90^@ with each other. The angles of reflection and refraction are r and t_1. The critical angle would be

A ray of light from a denser medium strikes a rarer medium. The reflec

1.	A ray of light from a denser medium strikes a rarer medium. The reflected and refracted rays make an angle of 90^@ with each other. The angles of reflection and refraction are r and t_1. The critical angle would be
Answer» `SIN^-1 (TAN R)` `tan^-1 (sin r)` `sin^-1 (tan r^1)` `tan^-1 (sin r^1)` ANSWER :A