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For more information, please see full course syllabus of AP Physics B
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Refraction of Light, Part 2

  • The index of refraction depends on the light wavelength; this explains phenomena such as the color spectrum emerging when white light strikes a prism, or the formation of the rainbow after a winter storm.
  • When light travels in a region 1 and strikes the surface, separating it from region 2, at an angle theta, then if n_1 > n_2, there exists a critical value for theta beyond which total internal reflection occurs. The value of the critical angle is given by the relation sin(theta_critical) = n_2 / n_1.
  • A convex lens (biconvex or plano-convex) is a converging lens; if parallel rays of light strike the lens on one side, they converge to a point on the other side. A concave lens, on the other, hand is a diverging lens.

Refraction of Light, Part 2

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Prism and the Rainbow 0:13
    • Monochromatic Light Through Prism
    • Sending White Light Through Prism
    • Violet Bends More Than Red Light
    • Angle Between Incident Light and Red
    • Water Drops in the Atmosphere
  • Total Internal Reflection 18:13
    • Surface has Air and Water
    • Increase Angle
    • Light Traveling in a Larger Index and Meets Lower Index
    • Water and Air Angle of Refraction is 90 Degree
  • Optical Fibers 32:22
    • Long Coaxial Cable
    • Choose Angle for No Light Leakage
  • Thin Lenses 45:13
    • Two Pieces of Transparent Glass
    • Plano Convex
    • Bi-Concave
    • Plano Concave
    • Lens Maker Formula
  • Ray Diagrams 53:44
    • Ray Through the Center
  • Extra Example 1: Angle of Incidence
  • Extra Example 2: Block Underwater