1. Tardigrade
  2. Question
  3. Physics
  4. A normally incident ray reflected at an angle of 90° . The value of critical angle is:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A normally incident ray reflected at an angle of $90^{\circ} .$ The value of critical angle is:

Ray Optics and Optical Instruments

Solution:

Critical angle $C$ is equal to incident angle if ray reflected normally
$\therefore C =90^{\circ}$ if-
i) $C >90^{\circ}$ then TIR takes place
ii) $C \leq 90^{\circ}$ then no TIR takes place.