Question

Total internal reflection can take place when light travels from ___________.

• A. diamond to glass
• B. water to glass
• C. air to water
• D. air to glass

Answer 1

The correct option is A diamond to glass

When a ray of light travels from a denser medium to rarer medium, then total internal reflection of light occurs provided that angle of incidence is greater than critical angle of medium interface.

Refractive index of diamond is $2.42$ and that of glass is $1.5$, thus total internal reflection can occur if light travels from diamond to glass.