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Total Internal Reflection

When light travels from glass to air it refracts away from the normal.If the angle of incidence reaches a critical angle then light refracts along the boundary.
sinθc = n2
n1
If the incident substance has a larger refractive index and if the angle of incidence is greater than the critical angle total internal reflection occurs.
refractive index
n		=   1   
sin c

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Specification: AQA Physics (7407), AS-level, 3.3.2.3 Refraction at a plane surface. Topic: Optics.

Key terms in this lesson

Equilibrium
An object is in equilibrium when the resultant force and the resultant moment acting on it are both zero.

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