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 m. What will be the value of number of longitudinal modes?

Consider a crystal of ruby laser whose length is 6 cm and the refracti

1.	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 m. What will be the value of number of longitudinal modes?
A.	3.9 x 10
B.	4.9 x 10
C.	5.6 x 10
D.	7.7 x 10
Answer» B. 4.9 x 10

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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 m. What will be the value of number of longitudinal modes?

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