Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index is placed on face AC of the prism. The prism is made of glass of refractive index 3//2. The limits of mu for which total internal reflection takes place on face AC is

Light is incident normally on face AB of a prism as shown in figure. A

1.	Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index is placed on face AC of the prism. The prism is made of glass of refractive index 3//2. The limits of mu for which total internal reflection takes place on face AC is
Answer» Solution :CRITICAL angle between glass and liquid face is `sin theta_c= mu/(3/2)=(2MU)/3`Angle of incidence , at face AC is `60^@`. For the TIR to takes place at the face AC, the angle of incidence at the face Ac `I gt theta_c`. `60^@ gt theta_c or sin 60^@ gt (2 mu)/3 or mu LT (3 sqrt3)/4`