When a ray moves from denser medium to rarer medium and incident angle is greater than critical angle
When a ray moves from rarer medium to denser medium and incident angle is less than critical angle
When a ray moves from rarer medium to denser medium and incident angle is equal to critical angle
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Total internal reflection is defined as the complete reflection of a light ray at the boundary of two media when the ray is in the medium with greater refractive index.Total internal reflection takes place in two following conditions: When the light is in the more dense medium and approaching the less dense medium.