wk3a - Lenses and Imaging(Part II Reminders from Part I...

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Lenses and Imaging (Part II) Reminders from Part I Surfaces of positive/negative power Real and virtual images Imaging condition Thick lenses Principal planes MIT 2.71/2.710 09/20/04 wk3-a-1
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The power of surfaces Positive Positive power : exiting rays converge converge Negative Negative power : exiting rays diverge + Simple spherical refractor (positive) 1 n R >0 + + R >0 R <0 n 1 1 n R >0 11 + N Plano-convex lens Bi-convex lens diverge MIT 2.71/2.710 09/20/04 wk3-a-2 R <0 Simple spherical refractor (negative) 1 n Plano-concave lens n 1 1 R >0 R <0 n R <0 N Bi-concave lens
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Thin lens in air P P n =1 n =1 in in x α out out x n = in in lens thin out out 1 0 1 x P x MIT 2.71/2.710 09/20/04 wk3-a-3 () = + = + = R R n R n R n P P P 1 1 1 1 1 lens thin Lens-maker’s formula
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Thin lens in air P P n =1 n =1 in in x α out out x n = in in lens thin out out 1 0 1 x P x in out in lens thin in out x x x P = Ray bending is proportional proportional to the distance to the distance from the axis MIT 2.71/2.710 09/20/04 wk3-a-4
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Positive thin lens in air object at Ray bending is proportional proportional to the distance to the distance from the axis MIT 2.71/2.710 09/20/04 wk3-a-5
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Positive thin lens in air 0 , in in = α x in lens thin out in out , x P x x = = 0 lens thin > P f thin lens as a “black box” Real Real image lens thin out in 1 P f x f = = Focal point Focal point = image of an object at Focal length Focal length = distance between lens & focal point MIT 2.71/2.710 09/20/04 wk3-a-6
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Negative thin lens in air object at Ray bending is proportional proportional to the distance to the distance from the axis MIT 2.71/2.710 09/20/04 wk3-a-7
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Negative thin lens in air Virtual
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wk3a - Lenses and Imaging(Part II Reminders from Part I...

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