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A series of slides from a university physics lecture covering topics such as total internal reflection, brewster's angle, dispersion, and lenses. The slides include explanations, diagrams, and questions for students. The lecture material is based on sections 26-5 to 27-3 of the textbook.
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Physics 1161: Lecture 18, Slide 1
Physics 1161: Lecture 18, Slide 2
normal
θ 2
θ 1
n 2
n 1
θ 1 = sin-1(n 2 /n 1 ) then θ 2 = 90
θc
Light incident at a larger angle will only have reflection (θi = θr)
θi^ θr
“critical angle”
Physics 1161: Lecture 18, Slide 3
Can the person standing on the edge of the pool be prevented from seeing the light by total internal reflection?
Physics 1161: Lecture 18, Slide 4
Physics 1161: Lecture 18, Slide 5
At each contact w/ the glass air interface, if the light hits at greater than the critical angle, it undergoes total internal reflection and stays in the fiber.
We can be certain that ncladding < ninside
ninside
Add “cladding” so outside material doesn’t matter!
ncladding
noutside
Physics 1161: Lecture 18, Slide 6
…when angle between reflected beam and refracted beam is exactly 90 degrees, reflected beam is 100% horizontally polarized!
Reflected light is partially polarized (more horizontal than vertical). But…
horiz. and vert. polarized
θθ θθB θθθθB
90º-θθθθB
horiz. polarized only! n^1 n 2
tan θB =
Physics 1161: Lecture 18, Slide 10
Wow look at the variation in index of refraction!
Where is red? Where is blue?
Physics 1161: Lecture 18, Slide 11
n 2 n 1
←t→
θθ θθ 1 θθ θθ 1
d
Physics 1161: Lecture 18, Slide 12
All rays parallel to principal axis pass through focal point F. (^) Double Convex
P.A.
A beacon in a lighthouse produces a parallel beam of light. The beacon consists of a bulb and a converging lens. Where should the bulb be placed?
nlens > noutside
F
P.A. F
Physics 1161: Lecture 18, Slide 13
Assumptions:
Object
Image is (in this case): Real or Imaginary Inverted or Upright Enlarged or Reduced
Physics 1161: Lecture 18, Slide 14
F
F Object
P.A.
Physics 1161: Lecture 18, Slide 15
Image Object
Object^ Image
Object
Image
This could be used as a projector. Small slide on big screen
This is a magnifying glass
This could be used in a camera. Big object on small film
Upright Enlarged Virtual
Inverted Enlarged Real
Inverted Reduced Real
Inside F
Past 2F
Between F & 2F