With necessary diagrams, explain the principle, working and construction of ruby laser. Mention some of the applications of laser. ( $\mathbf{2} \boldsymbol{\times} \mathbf{1 0} \boldsymbol{=} \mathbf{2 0}$ Marks)
Explanation
Ruby laser is a type of solid-state laser that has numerous applications in various fields, and understanding its principle, working, and construction is essential for designing and operating such lasers.
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