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In a ruby laser, laser light of wavelength 694.3 nm is emitted. The ruby crystal is 7.80 cm long, and the index of refraction
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Answer #1

Wavelength, lambda' = 694.3/1.75 = 396.74 nm

Number of wavelength, N = L/lambda'

N = 0.078/(396.74 x 10^-9)

N = 1.97 x 10^5

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