Question

A ray of light travelling from denser to rarer medium gets reflected back to the denser medium. This phenomenon is called as:

• A. Final internal reflection
• B. Total internal reflection
• C. Critical angle of reflection
• D. Total internal refraction

Answer 1

The correct option is B Total internal reflection

Total internal reflection is a phenomenon where a ray of light travelling from denser to rarer medium gets reflected back to the denser medium. This occurs when the light ray passes from a denser to a rarer medium and not vice versa also when the angle of incidence is greater than the critical angle (angle for which angle of refraction becomes ${90}^{\circ }$)