GKFix MCQ Question

What condition must be met for total internal reflection (TIR) to occur?

• A. Light must travel from a rarer medium to a denser medium
• B. Light must travel from a denser medium to a rarer medium and the angle of incidence must exceed the critical angle
• C. The angle of incidence must be exactly 90 degrees
• D. The wavelength of light must be very small