[Solved] A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 μm. Determine the number of longitudinal modes.

Q.	A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 μm. Determine the number of longitudinal modes.
A.	1×102
B.	3×106
C.	2.9×105
D.	2.2×105
Answer» D. 2.2×105

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