The refractive index of air with respect to glass is expressed as gμa

1.	The refractive index of air with respect to glass is expressed as gμa = Sin i/sin r.(a) Write down a similar expression for a μ g in terms of the angles i and r.(b) if angle r = 90°, what is the corresponding angle i called?(c) what is the physical significance of the angle i in part (b)?
Answer» (a) a^μg = sin r/sin i (b) If refractive angle, r = 90°, the corresponding angle of incidence, i will be equal to critical angle. (c) If the angle of incidence exceeds the value of I obtained in part (b) (i.e., critical angle), total internal reflection will occur.

The refractive index of air with respect to glass is expressed as gμa = Sin i/sin r.(a) Write down a similar expression for a μ g in terms of the angles i and r.(b) if angle r = 90°, what is the corresponding angle i called?(c) what is the physical significance of the angle i in part (b)?

Answer»

(a) a^μg = sin r/sin i

(b) If refractive angle, r = 90°, the corresponding angle of incidence, i will be equal to critical angle.

(c) If the angle of incidence exceeds the value of I obtained in part (b) (i.e., critical angle), total internal reflection will occur.