GKFix MCQ Question

For total internal reflection to occur, which of the following conditions must be met?

• A. Light must travel from a rarer medium to a denser medium and the angle of incidence must be greater than the critical angle
• B. Light must travel from a denser medium to a rarer medium and the angle of incidence must be greater than the critical angle
• C. Light must travel from a denser medium to a rarer medium and the angle of refraction must be 90°
• D. Light must travel from a rarer medium to a denser medium and the angle of incidence must be less than the critical angle