refraction of light - Physics 113 Lecture 24 Refraction of...

Physics 102: Lecture 17, Slide 1
•
Today’s Lecture will cover textbook sections
23.4-23.9
Physics 113: Lecture 24
Refraction of Light
Physics 113 Dr. Renat Letfullin

Physics 102: Lecture 17, Slide 2
Today:
•
Refraction of light
•
Snell’s Law
•
Total Internal Reflection
•
Fiber Optics
•
Brewster’s Angle
•
Experimental Activity: Snell’s Law
Physics 113 Dr. Renat Letfullin

Physics 102: Lecture 17, Slide 3
Refraction
Reflection:
Refraction:
Absorption
Flat Mirror:
image equidistant behind
Spherical Mirrors:
Concave or Convex
Flat Lens:
Window
Spherical Lenses:
Concave or Convex
Today
Last Time
Today
θ
i
θ
r
θ
1
θ
2
n
2
n
1
θ i =
θ r
n 1 sin( θ 1 )= n 2
sin( θ 2 )
Physics 113 Dr. Renat Letfullin

Physics 102: Lecture 17, Slide 4
Physics 113 Dr. Renat Letfullin
v =
c
n
Speed of light in
medium
Index of refraction
Speed of
light in
vacuum
n 1
v < c
so
Index of Refraction
186,000 miles/second: it’s not
just a good idea, it’s the law!
always!

Physics 102: Lecture 17, Slide 5
Light Doesn’t Just Bounce
It Also Refracts!
Reflected: Bounces (Mirrors!)
Refracted: Bends (Lenses!)
f d d
i
1 1 1
0
= +
θ
i
θ
r
θ
1
θ
2
n
2
n
1
θ i =
θ r
n 1 sin( θ 1 )= n 2
sin( θ 2 )
Physics 113 Dr. Renat Letfullin

Physics 102: Lecture 17, Slide 6
Snell’s Law
n
1
n
2
When light travels from one medium to another the speed
changes v=c/n, but the frequency is constant. So the