Difference between revisions of "Forest ElemPhysics Optics ThinFilms"
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| + | Prperties of Refection and Refraction | ||
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| + | 1.) Waves reflect from higher index of refraction materials will have a half wave shift. | ||
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| + | 2.) Frequency of light stays the same no matter what the medium change | ||
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| + | 3.) The wavelength of light changes with the index of refraction. | ||
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| + | <math>n \equiv \frac{c}{v}</math> | ||
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| + | <math>\frac{\lambda_0} {\lambda} = \frac{v_o/f}{v/f} = \frac{n}{n_0} = n : n_0 =1 if air</math> | ||
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Thin Film Applet | Thin Film Applet | ||
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1.) <math>n_{air} = 1 < n_{MgF2} = 1.38 < n_{glass} = 1.5</math> | 1.) <math>n_{air} = 1 < n_{MgF2} = 1.38 < n_{glass} = 1.5</math> | ||
| − | This means that reflection on all the interfaces will have a half wavelength <math>(\pi)</math> phase shift. | + | This means that reflection on all the interfaces will have a half wavelength <math>(\pi)</math> phase shift because wave is reflected from a higher index of refraction both times. |
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| + | 2.) The wavelength shortens each time. | ||
[http://wiki.iac.isu.edu/index.php/Forest_ElemPhysics_Optics Go back] [[Forest_ElemPhysics_Optics]] | [http://wiki.iac.isu.edu/index.php/Forest_ElemPhysics_Optics Go back] [[Forest_ElemPhysics_Optics]] | ||
Revision as of 04:59, 20 April 2009
Prperties of Refection and Refraction
1.) Waves reflect from higher index of refraction materials will have a half wave shift.
2.) Frequency of light stays the same no matter what the medium change
3.) The wavelength of light changes with the index of refraction.
Thin Film Applet
http://physics.bu.edu/~duffy/semester2/c26_thinfilm.html
Thin Film of MgF2 on glass
1.)
This means that reflection on all the interfaces will have a half wavelength phase shift because wave is reflected from a higher index of refraction both times.
2.) The wavelength shortens each time.