Light — practice question

Under what conditions will light undergo total internal reflection?

• Aincident light is in the less dense medium; angle of incidence less than the critical angle
• Bincident light is in the less dense medium; angle of incidence greater than the critical angle
• Cincident light is in the more dense medium; angle of incidence less than the critical angle
• Dincident light is in the more dense medium; angle of incidence greater than the critical angle