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Total Internal Reflection
When light is incident upon a medium of lesser index ofrefraction, the ray is bent away from the normal, so the exit angle is greater than the incident angle. Such reflection is commonly called "internal reflection". The exit angle will then approach 90° for some critical incident angle θc , and for incident angles greater than the critical angle there will be total internal reflection.
The critical angle can be calculated from Snell's law by setting the refraction angle equal to 90°. Total internal reflection is important in fiber optics and is employed in polarizing prisms.
For any angle of incidence less than the critical angle, part of the incident light will be transmitted and part will be reflected.
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it is an angle of incidence to which the refracted ray graces the surface of separation if the ray travels from one medium to other