Numerical - No. of longitudinal modes in crystal for given length & R.I.

Q.  Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of number of longitudinal modes?
- Published on 21 Nov 15

a. 3.9 x 105
b. 4.9 x 105
c. 5.6 x 105
d. 7.7 x 105

ANSWER: 3.9 x 105

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