A light ray is propagating in a crystal where its wavelengthis 599 nm. It strike

Question

A light ray is propagating in a crystal where its wavelengthis 599 nm. It strikes the interior surface of the crystal with anincidence angle of 30° and emerges into the surrounding air at74° to the surface normal. A)  Find the light's frequency.
B) Find its wavelength in air in nanometers A light ray is propagating in a crystal where its wavelengthis 599 nm. It strikes the interior surface of the crystal with anincidence angle of 30° and emerges into the surrounding air at74° to the surface normal. A)  Find the light's frequency.
B) Find its wavelength in air in nanometers

Explanation / Answer

A light ray is propagating in a crystal where its wavelengthis 599 nm. It strikes the interior surface of the crystal with anincidence angle of 30° and emerges into the surrounding air at74° to the surface normal.
1/=sin30/sin74=>=1.922
so speed of light in thecrystal=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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