a- A laser cavity of volume about 2000 mm and a central wavelength of 1500 nm: Determine the number of allowed oscillating modes within a wavelength changing of 0.2 nm.

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A: We need to convert  μm into m 1.0 μm=10-6 m

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Q: Time C wwwwwww

A: Here, T=2πmk where, m= mass k= spring constant