PY208N-Lecture-28

# PY208N-Lecture-28 - Physics 208N-004 Lecture#28 30 March...

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1 Physics 208N-004 Lecture #28 – 30 March 2011 Chapter 32: 1-3 Light Reflection (Rays and Mirrors) The Ray Model of Light Reflection; Image Formation by a Plane Mirror Formation of Images by Spherical Mirrors Index of Refraction Refraction: Snell’s Law Units of Chapter 32 Visible Spectrum and Dispersion Total Internal Reflection; Fiber Optics Refraction at a Spherical Surface

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2 Light very often travels in straight lines. We represent light using rays, which are straight lines emanating from an object. This is an idealization, but is very useful for geometric optics . 32-1 The Ray Model of Light Law of reflection: the angle of reflection (that the ray makes with the normal to a surface) equals the angle of incidence. 32-2 Reflection; Image Formation by a Plane Mirror
3 With diffuse reflection, your eye sees reflected light at all angles. With specular reflection (from a mirror), your eye must be in the correct position. 32-2 Reflection; Image Formation by a Plane Mirror 32-2 Reflection; Image Formation by a Plane Mirror Example 32-1: Reflection from flat mirrors. Two flat mirrors are perpendicular to each other. An incoming beam of light makes an angle of 15° with the first mirror as shown. What angle will the outgoing beam make with the second mirror?

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4 What you see when you look into a plane (flat) mirror is
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## This note was uploaded on 09/18/2011 for the course PY 208M 87878 taught by Professor George during the Spring '09 term at N.C. State.

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PY208N-Lecture-28 - Physics 208N-004 Lecture#28 30 March...

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