Optical Images

# Optical Images - PHY 2049C General Physics B Fields,...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) Ray-optics 2) Images from mirrors 3) Images from lenses

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Index of Refraction When light enters a medium , its speed changes, it slows down ! (It speeds up again once outside ) The index of refraction, e.g. the speed of light in water n = c v , n 1 Material n Vacuum 1.0000 Air 1.0003 Water 1.3300 Glass 1.5000 Diamond 2.4200 v = 3 × 10 8 m / s 1.33 = 2.25 × 8 m / s v = c n - + - + - + - + E
Snell's Law of Refraction If light passes from a “thinner” to a “denser” medium, (n 2 >n 1 ), The wavelength changes with 1/n: The waves changes direction: () ( ) 12 11 2 2 1 2 21 sin λ = θθ n θ =n θ θ n = θ n λ wave-fronts ray Reflected ray , vc c λ =v = λ n= f nn f

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Question 3 A fish swims below the surface of the water at P. An observer at O sees the fish at 1. a greater depth than it really is. 2. the same depth. 3. a smaller depth than it really is.
Chapter-Outlook We will learn how to create images with Mirrors and Lenses . Mirrors and Lenses can focus or de-focus light. We will use that to make optical images and construct the relation between objects and images using the principles of ray-optics, which is a lot of fun once you get the hang of it.

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## This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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Optical Images - PHY 2049C General Physics B Fields,...

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