Question

If a ray of light travelling from denser to rarer medium reflects 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

If a ray of light travelling from denser to rarer medium and the angle of incidence is greater than the critical angle(angle for which angle of refraction becomes 9o^$\circ$), then it reflects back to the same medium and this phenomenon is known as total internal reflection.