A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45^@. The ray undergoes total internal reflection IF mu is the refractive index of the medium with respect to air, select the possible value(s) of mu from the following

A ray of light travelling in a transparent medium falls on a surface s

1.	A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45^@. The ray undergoes total internal reflection IF mu is the refractive index of the medium with respect to air, select the possible value(s) of mu from the following
Answer» Solution :For total INTERNAL reflection to OCCUR, `I gt ` CRITICAL angle c or SIN `I gt sin C` `or sin 45^@ gt 1/mu or 1/sqrt2 gt 1/mu or mu gtsqrt2 or mu gt 1.414` Possible values of `mu` can be ( c) 1.5 or (d) 1.6