This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: The Reflection of Light: Mirrors 1 Plane Mirrors The laws of reflection and refraction can be developed using a geometric method proposed by Huygens in 1678. His wave model is adequate for understanding many practical aspects of the propagation of light. Huygens principle: All points on a given wavefront are taken as point sources for the production of spherical secondary waves. The new position of the wavefront after some time is the surface tangent to the spherical waves. Wavefront: Surface passing through those points of a wave that have the same phase and amplitude. Ray approximation: The rays of a given wave are straight lines perpen- dicular to the wavefronts. In the ray approximation one assumes that that a wave moving through a medium travels in a straight line in the direction of its rays. Dr.D.Wackeroth Spring 2005 PHY102A The Reflection of Light: Mirrors We now study the formation of images. Images can be formed by either reflection or refraction of light. We will start discussing the formation of images by reflection using mirrors. We begin by examining the simplest possible mirror, the plane mirror. Consider a point light source (=object) placed at a point O at a distance d in front of a mirror. d is called the object distance . Light rays leave the source and are reflected by the mirror. To the observer, the rays appear to come from a point, I , behind the mirror....
View Full Document