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Lecture-23-04-13-10

# Lecture-23-04-13-10 - Lecture-22 treated Refraction by...

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1 Lecture-22 treated: Refraction by Wavefront Analysis (Construction according to Huygens Principle ) Snell’s Law : ) 1 2 ( l 1 2 Observe: 1 (air) = l sin 1 = c 1 /f 2 (glass) = l sin 2 = c 2 /f Equate two above relations to get: Or, 2 2 1 1 sin sin c c c c vacuum

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2 Geometrical Optics : Lenses Refraction at interface between two media Wave velocity depends on medium property: Define index of refraction n v vacuum /v medium Then in medium wave velocity = c/n Ex. Displacement of images on refraction 2 2 1 1 sin sin n n Snell’s Law Lateral displacement Axial displacement Air Water
3 Parallel lines Lecture-23 Geometrical Optics - continued Lensmaker’s equation Snell’s law gives and Also from figure, we have Or , For thin lens we obtain Lensmaker’s equation : Note that R 1 > 0 if center of curvature is on right, and R 2 > 0 if on left, of lens. 2 1 2 1 4 3 ) ( n n n 1 1 1 1 2 2 2 2 2 nR h R h nf h h R h 2 1 R 2 R 1 2 1 n 3 4 n ; sin 1 1 1 1 R h f h and R h 2 2 2 ; . , 1 1 ) 1 ( 1 2 1 2 1 h h where R R n f

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Lecture-23-04-13-10 - Lecture-22 treated Refraction by...

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