The wavelength of red helium-neon laser light in air is 632.8 nm. (a) What is its frequency? |Hz (b) What is its wavelength in glass that has an index of refraction of 1.49? nm (c) What is its speed in the glass? Mm/s

Q: Date: + e -Co S근 2.

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Q: 2.31 was , thanks

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