L34_a - REFRACTION The speed of light varies between...

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Unformatted text preview: REFRACTION The speed of light varies between different transparent materials Result: Light crossing a boundary between materials with different speeds of light at an angle to the normal is BENT SNELLS LAW: Relates bending of refracted ray to speed of light in materials constant sin sin 1 2 1 2 = = v v When wave crosses boundary, frequency remains constant but wavelength changes o can derive Snells law from change in direction of continuous wavefronts when wavelength changes 1 1 2 v 1 v 2 normal refracted ray material 2 material 1 reflected ray incident ray SNELLS LAW from WAVEFRONTS Look at green and yellow triangles 1 1 2 2 sin sin (common) hypotenuse = = So: 2 1 2 1 2 1 sin sin = = v v INDEX OF REFRACTION ( n ) : define medium in light / v c n = where c is the speed of light in vacuum (or air) o v c always so n 1 always air n 1 glass n 1.5 water n 1.33 diamond n 2.4 Can now write wavelength in material in terms of n and wavelength in vacuum f v 2 2 = f v 1 1 = 2 1 1 2 SNELLS LAW AND INDEX OF REFRACTION:...
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This note was uploaded on 03/08/2012 for the course PHYSICS 1051 taught by Professor Michaelmorrow during the Winter '12 term at Memorial University.

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L34_a - REFRACTION The speed of light varies between...

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