What is the Total Internal Reflection of Light?
When a light
ray tries to move from glass to
air at an
angle greater than the critical angle (see the previous page)
the refracted ray cannot escape from the glass.
Refraction cannot happen and all of the light is reflected
at the glass / air boundary, as if it had hit a mirror, i = r.
It is called internal reflection because it
occurs inside the glass, and it is called total
because all the light must be reflected.
Internal Reflection (TIR)
has uses in prisms and optical fibres.
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