A light ray is propagating in a crystal where its


A light ray is propagating in a crystal where its wavelengthis 531 nm. It strikes theinterior surface of the crystal with an incidence angleof 30° and emerges into thesurrounding air at 76° to thesurface normal.

a) Find the light's frequency.

Hz

(b) Find its wavelength in air.

nm

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Physics: A light ray is propagating in a crystal where its
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