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My Chapter 23 Lecture

My Chapter 23 Lecture. Chapter 23: Reflection and Refraction of Light. Reflection Refraction Total Internal Reflection. § 23.2 Reflection of Light.

addison-hickman
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My Chapter 23 Lecture

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  1. My Chapter 23 Lecture

  2. Chapter 23: Reflection and Refraction of Light • Reflection • Refraction • Total Internal Reflection

  3. §23.2 Reflection of Light When light is reflected from a smooth surface the rays incident at a given angle are reflected at the same angle. This is specular reflection.

  4. Reflection from a rough surface is called diffuse reflection. “Smooth” and “rough” are determined based on the wavelength of the incident rays.

  5. The angle of incidence equals the angle of reflection. The incident ray, reflected ray, and normal all lie in the same plane. The incident ray and reflected ray are on opposite sides of the normal.

  6. §23.3 Refraction of Light When light rays pass from one medium to another they change direction. This is called refraction.

  7. Snell’s Law: where the subscripts refer to the two different media. The angles are measured from the normal. When going from high n to low n, the ray will bend away from the normal.

  8. The incident ray, transmitted ray, and normal all lie in the same plane. The incident and transmitted rays are on opposite sides of the normal.

  9. incident wave 1 n1 = 1.00; air surface n2 = 1.33; water 42° Transmitted wave Normal Example (text problem 23.11): Sunlight strikes the surface of a lake. A diver sees the Sun at an angle of 42.0° with respect to the vertical. What angle do the Sun’s rays in air make with the vertical?

  10. §23.4 Total Internal Reflection The angle of incidence for when the angle of refraction is 90° is called the critical angle c.

  11. If the angle of incidence is greater than or equal to the critical angle, then no wave is transmitted into the other medium. The wave is completely reflected from the boundary. Total internal reflection can only occur when the incident medium has a larger index of refraction than the second medium.

  12. 2=90 n2 = 1.0; air Transmitted wave n1 = 1.77; sapphire surface 1 incident wave Normal Example (text problem 23.22): Calculate the critical angle for sapphire surrounded by air.

  13. Summary • The Laws of Reflection • The Laws of Refraction • Condition for Total Internal Reflection

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