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a) Explain the construction and working of He Ne laser with a suitable energy level diagram. Hence, explain its applications. by) ile reverberation time of an empty hall is 1.5 sec. The same hall…
- a) Explain the construction and working of He-Ne laser with a suitable energy level diagram. Hence, explain its applications. by) ile reverberation time of an empty hall is 1.5 sec. The same hall with 500 people is 1.4 sec. Find the revetberation time with 800 people in hall.
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