# week03 - Today Today’s class • Overview of course •...

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Unformatted text preview: Today Today’s 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 θ tan θ θ My picture is not drawn with θ small for ease of viewing. Imagine it is small. Concave if θ 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 Today’s class • Overview of course •...

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