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)1×10² B)3×10⁶ C)2.9×10⁵ D)2.2×10⁵

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The Answer of 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)1×10² B)3×10⁶ C)2.9×10⁵ D)2.2×10⁵

A Ruby Laser Has a Crystal of Length 3 Cm