The figure depicts a simplistic optical fiber: a plastic core (n1 = 1.54) is surrounded by...
The figure depicts a simplistic
optical fiber: a plastic core (n1 = 1.54) is surrounded by a
plastic sheath (n2 = 1.46). A light ray is incident on one end of
the fiber at angle ?. The rays is to undergo total internal
reflection at point A, where it encounters the core-sheath
boundary. (Thus there is no loss of light through that boundary.)
What is the maximum value of ? that allows total internal
reflection at A?
Homework Answers
At critical angle,
n1/n2 = 1/sin(c)
Sin(theta) = n1 sqrt(1 - (n2/n1)^2)
Theta = arcsin sqrt(n1^2 - n2^2)
Theta = arcsin sqrt(1.54^2 - 1.46^2)
Theta = 29.33 degree
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