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Optics
Total internal reflection
The Critical Angle
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Created by
Awais Rasul
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Cards (5)
Total internal reflection
occurs when the angle of
incidence
exceeds the
critical angle
, which depends on the
refractive
indexes of the two media.
When the angle of
incidence
is
equal
to the
critical angle
, the light ray
refracts
along the boundary between the 2 media.
The
critical angle
can be calculated using
Snell's law
(n1
sinθ1
= n2
sinθ2
).
When the angle of
incidence
is
greater
than the
critical angle
, the light ray is
reflected
back into the
same
medium.
critical
angle = sin-1(
n2
/
n1
) where n1
>
n2
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