Question

The meaning of the statement "The critical angle for diamond is 24” is:

• A. Light undergoes refraction when it is incident at an angle more than 24^o
• B. Light undergoes TIR when it is incident at an angle less than 24^o
• C. Light undergoes refraction at 90^o when it is incident at an angle equal to 24^o whilst traveling form diamond to air
• D. Light undergoes refraction at 90^o when it is incident at an angle equal to 24^o whilst traveling form air to diamond

Answer 1

The correct option is C

Light undergoes refraction at 90^o when it is incident at an angle equal to 24^o whilst traveling form diamond to air

It means when a ray of light travels from diamond to air for angle of incidence of 24°, the angle of refraction is 90°.