A ruby laser has a crystal of length 3 cm with a refractive index of 1 – McqOptions

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1.	A ruby laser has a crystal of length 3 cm with a refractive index of 1.60, wavelength 0.43 m. Determine the number of longitudinal modes.
A.	1 10<sup>2</sup>
B.	3 10<sup>6</sup>
C.	2.9 10<sup>5</sup>
D.	2.2 10<sup>5</sup>
Answer» E.

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