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Chapter 23 -5 Refraction: Snell’s Law

Chapter 23 -5 Refraction: Snell’s Law. *When light passes from one medium to another, or from one density to another, it changes speed and its path is bent. Part of the incident light can be reflected at the boundary. This bending of light is called refraction.

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Chapter 23 -5 Refraction: Snell’s Law

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  1. Chapter 23 -5 Refraction: Snell’s Law *When light passes from one medium to another, or from one density to another, it changes speed and its path is bent. Part of the incident light can be reflected at the boundary. This bending of light is called refraction. The incoming angle, formed with the medium, is the angle of incidence and the angle formed between the medium and the ray after refraction is the angle of refraction. Snell’s law (Willebrord Snell 1621) N1 sin Q1 = N 2 sin Q1 (Snell’s law of refraction)

  2. 23-5 Cont’d: Snell’s Law • If light enters a medium where n is greater, then the light will be bent towards the normal • If N2 is less than N1 then light bends away from the normal. (See p. 697) • See Example 23-8 and 23-9 p698

  3. 23-6 Total Internal Reflection: Fiber Optics • When light passes from one material to a second material, where n is less, the light bends away from the normal, and at some incident angle, called the critical angle Qc , This causes an angle of refraction of 90o , and the resultant beam will be reflected in the original material. This is called total internal reflection. • See Example 23-10 p699 • This is used to create fiber-optics…a bundle of these fibers is called a light-pipe.

  4. 23-7 Thin Lenses; Ray Tracing • See p 703 for concave and convex lens diagrams. • Power, P = 1/f • Any lens that is thicker in the center is called a convex or converging lens. • Any lens that is thinner in the center is called a concave or diverging lens. • See p 704 for ray diagram steps for lenses. • Rays do not pass through the image on a virtual image. (See p.705)

  5. 23-7 cont’d • Lens equation: 1/di + 1/do = 1/f • Magnification: h / h = (di-f)/f = di / do . • See p. 706 and 707 for sign conventions.

  6. 23-10 Problem Solving With Combinations of Lenses • See examples 23-11, 23-12 and 23-13

  7. 23-11 The Lensmaker’s Equation • The lens-maker’s equation relates the focal length to the radius of curvature for a lens. • 1/f= (n-1)( 1/r1 +1/r2) • See example 23-16 p 714

  8. Homework TXT23Bpage 720-721 Prob. 30-33, 40-42, 48-52, 64,68-69

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