Give a brief explanation of any TWO topics.What is Laser? Describe its principle and operation.Explain the principle, construction and working of mass spectrograph.State Gauss’s law and show that θ=Q/ε0

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Give a brief explanation of any TWO topics.What is Laser? Describe its principle and operation.Explain the principle, construction and working of mass spectrograph.State Gauss’s law and show that θ=Q/ε0