Question

A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___.

• A. dispersion of light
• B. total internal reflection
• C. total internal refraction
• D. refraction

Answer 1

The correct option is B

total internal reflection

When a ray of light travelling in a denser medium, is incident at the surface of a rarer medium at an angle of incidence greater than the critical angle for the pair of media, the ray is totally reflected back into the denser medium. This phenomenon is called total internal reflection.