AI Discussion of
Your browser does not support the audio element.
Total Internal Reflection - PHET
VIDEO
showmethephysics Instruction
Assessment
VIDEO
Show Me The Physics
VIDEO
| Rutgers University Physics |
VIDEO
internalReflection2
[
Flash ] Show Me The Physics
Show Me The Physics
Did you know ...
Skipping a rock across water has one thing in
common with 'skipping' light off a media boundary.
Wikimedia
Prostoneskipping.com
A stone will skip across a pond only at
wide angles
2.
Critical Angle
θc – angle of incidence for which the
angle of refraction equals 90 0 when light travels
inside one medium that borders on air or a vacuum
Deriving Critical Angle Equation
n1 sinθ1 = n2
sinθ2
Substitute θc , θ2 = 90, n2
= 1
n1 sinθc = 1sin90
n1 sinθc = 1
Ex) Find θc
for Lucite
sin θc = 1/n1
From reference table, n1 =
1.50
sinθc = 1/1.50
θc = 41.8
3. Total Internal Reflection
What is this called?
Rutgers University Physics
[ Flash ]
(These kinds of fibers are coated with
materials that have a low index of refraction (fast). cladding .)
VIDEO
St. Mary's University's Astronomy
and Physics Dept.
When θ1 > θc
(Outside Medium Must Be Faster)
Trouble Viewing Video Above?
|
Total Internal Reflection |
Rutgers U. Physics
Air
When θ1 = θc
θ2 = 900
When θ < θc Refraction
Refraction of Light
Rick Reed
a) Total Internal Reflection?
Choice 2
(Outside Medium Must be Fast)
b) Refraction?
Choice 3
c) Impossible?
Choice 1
(Light always crosses over normal)
What's wrong with this picture?
Part of the ray
Enrichment
VIDEO
|
Onsite
|
St. Mary's U
Astronomy and Physics Dept.
