week03 - Today Todays class Overview of course mirrors...

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Unformatted text preview: Today Todays class Overview of course mirrors waves and matching conditions finish Lab 1 Please turn in HW2 for next week, lab report for lab 1 Sarah Eno 2 EYE How does light get from the object to the eye? While the object emits light in all directions, only the blue ray gets to the eye Sarah Eno 3 Mirror The eye assumes the light ray has always traveled straight, and extrapolates it straight back. Sarah Eno 4 Mirror Image is: 1) Upright 2) Virtual (light does not actually come from where image is located) 3) Same size as original object 4) Same distance from mirror as object Curved mirrors Sign convention: equations will turn out pretty if we define signs correction object distance (OD) positive if object is to left of mirror and real imagine distance (ID) positive if to left of mirror (real) and negative if to right of mirror (virtual) Radius of mirror is positive for convex, negative for concave concave SP SC = S ' P CS ' SC = S R and S ' C = R S ' R<0 since concave, so SC = S + R and S ' C = R S ' Approximations are always useful when dealing with reality. With optics, one of the most useful apprxoimations is the small angle approximation. sin tan My picture is not drawn with small for ease of viewing. Imagine it is small. Concave if is small S SP and S' S'P so S S + R = S ' S ' + R ( ) 1 S + 1 S ' = 2 R f 2 R 1 S + 1 S ' = 1 f f S ' R 2 flat mirror: R...
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week03 - Today Todays class Overview of course mirrors...

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