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1 Physics Waves & Oscillations Lecture 26 Propagation of Light Hecht, chapter 5 Spring 2015 Semester Matthew Jones
2 Geometric Optics Typical problems in geometric optics: Given an optical system, what are the properties of the image that is formed (if any)? What configuration of optical elements (if any) will produce an image with certain desired characteristics? No new physical principles: the laws of reflection and refraction are all we will use We need a method for analyzing these problems in a systematic an organized way
3 Types of Images Real Image: light emanates from points on the image Virtual Image: light appears to emanate from the image Real image Virtual Image
4 Spherical Mirrors Central axis
5 Spherical Mirrors Central axis Focal length, Image distance, Object distance,
6 Focal Points of Spherical Mirrors = 2 Sign convention used in Hecht: Concave: Radius of curvature, <0 Focal length, >0 Convex: Radius of curvature, >0 Focal length, < = 1
7 Sign Conventions Be careful about sign conventions! There is nothing physical about making >0 for convex mirrors and <0for concave mirrors. Different books use different conventions. Make sure you know what sign conventions are used in any formulas you make use of. This is also true in many other fields of physics.
8 Properties of Images 1. Ray parallel to central axis reflected through focal point 2. Ray through focal point reflected parallel to central axis. Central axis Reflected rays pass through the image: it is a real image The image is inverted.
9 Properties of Images = 1 Objectdistance, >0 Focal length, <0 Image distance, <0 Central axis Reflected rays do not pass through the image, even though they might appear to the image is virtual.
10 Lenses Insert a transparent object with >1that is thicker in the middle and thinner at the edges Spherical waves can be turned into plane waves.
11 AsphericalSurfaces What shape of surface will change spherical waves to plane waves? Time to travel from S to plane DD must be equal for all points A on the surface.
12 AsphericalSurfaces constant This is the equation for a hyperbola if >1and the equation for an ellipse if 1. n ti n t /n i > 1 -hyperbola n ti n t /n i < 1 -ellipsoid
13 Spherical Lens Optical axis image distance object distance Law of cosines: = + 2cos l 2 cos l 2 cos
14 Spherical Lens Fermat s principle: Light will travel on paths for which the optical path length is stationary (ie, minimal, but possibly maximal) l = cos l = + +2 cos = l = + sin 2l l + l = 1 + l sin =0 2l l l But P will be different for different values of
15 Spherical Lens + = 1 l l l l Approximations for small : cos=1 sin= l = l = + = The position of P is independent of the location of A over a small area close to the optical axis. Paraxial rays: rays that form small angles with respect to the optical axis. Paraxial approximation: consider paraxial rays only.
16 Spherical Lens For parallel transmitted rays, + = = First focal length (object focal length): = Second focal length (Image focal length) = >0, 0 (converging lens)
17 Spherical Lens When <0: A virtual image appears on the object side.
18 Sign Conventions Optical axis image distance object distance Assuming light enters from the left:, >0when left of vertex,, 0when right of vertex, 0if is on the right of vertex,
19 Sign Conventions > + = Convex surface: is positive for objects on the incident-light side is positive for images on the refracted-light side is positive if is on the refracted-light side (see table 5.1 in the 4 th edition )
20 Sign Conventions > + = (same formula) Concave surface: is positive for objects on the incident-light side is negative for images on the incident-light side is negative if is on the incident-light side
21 >0 >0 <0 Spherical Lens Central axis
22 Magnification Using these sign conventions, the magnification is = Ratio of image height to object height Sign indicates whether the image is inverted
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