Total Internal Reflection – Practice


1) Calculate the critical angle for a light ray passing from air into diamond (n=2.42):

2) A light ray travels from air into a 2nd medium. The critical angle is found to be 41º. Determine the refractive index of the second medium:

3) A light ray passes from one medium (n=1.35) into a second medium (n=1.45). Determine if total internal reflection occurs in this situation:

4) A light ray strikes a perspex surface (n=1.5) at an angle of 35º. Does total internal reflection occur?

Quick Answers:

1) 24.4º

2) 1.52

3) no

4) no total internal reflection. 35º < i(41º)

Worked Answers: