Question

define critical angle. ​

Answer 1

Answer:

Critical angle is angle of incidence for which angle of refraction in rarer medium is 90 degree for a given pair of media

Answer 2

.CRITICAL ANGLE -WHEN A RAY OF LIGHT PASSES FROM A MEDIUM OF HIGHER OPTICAL DENSITY TO A MEDIUM OF LOWER OPTICAL DENSITY ,THE ANGLE OF INCIDENCE AT WHICH THE ANGLE OF REFRACTION BECOMES 90° IS THE CRITICAL ANGLE.