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posted by  Echoes on 11/6/2009 12:36:33 PM  |  status: Closed  |  Earned Karma: 121

Light Frequency/Wavelength... Optics... Lifesaver

Course Textbook Chapter Problem Needs by
Calculus Based Physics Essential University Physics, Volume 2 N/A N/A 11/8/2009 at 11:00:00 PM
Question Details:
A light ray is propagating in a crystal where its wavelength is 599 nm. It strikes the interior surface of the crystal with an incidence angle of 30° and emerges into the surrounding air at 74° to the surface normal.
A)  Find the light's frequency.
B) Find its wavelength in air in nanometers
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posted by E=mc*c (MNV) on 11/6/2009 5:54:10 PM  |  status: Live
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Response Details:
A light ray is propagating in a crystal where its wavelength is 599 nm. It strikes the interior surface of the crystal with an incidence angle of 30° and emerges into the surrounding air at 74° to the surface normal.
1/μ=sin30/sin74=>μ=1.922
so speed of light in the crystal=3*108/1.922=1.5608*108m/sec
A)  Find the light's frequency.
frequency=1.5608*108/599*10-9=2.605*1014Hz
B) Find its wavelength in air in nanometers
wavelength=3*108/2.605*1014=1151.63nm
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