A RAY OF LIGHT FROM A DENSER MEDIUM STRIKES A RARE MED. AS - THE REF. & REFRAC. MAKE 90 ..

Описание: A ray of light from a denser medium strikes a rarer medium at angle of incidence i. The reflected and refracted rays make an angle of 90∘ with each other. The angle of reflection and refraction are r and r′. The critical angle is--