Ray Optics and Optical Instruments NCERT Solutions Refractive index of a glass slab using microscope Ray Optics and Optical Instruments – Related Topics The video below explains this: Critical Angle & Total Reflection Detailed Video Explanation: When i (angle of incidence) > i c (critical angle), total internal reflection occurs. As the light moves from a medium that has a higher refractive index to the one having a lower one, the light rays that are refracted bend away from the normal.
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