(1) The ray of light should travel in the optically denser medium towards the rarer medium.
(ii) The angle of incidence at the refractive surface should be greater than the critical angle for given pair of media.
Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.
State the necessary conditions for the phenomenon of total internal reflection to occur.
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Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle. The critical angle depends on the refractive indices of the two media. Additionally, the light must be incident on the boundary from the denser medium.
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