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1. What is the significance of the minus sign (-) in the magnification equation, m = -(v/u)? 2. In the first part of the experiment, a rough but reasonable estimate of the focal length of the converging lens is obtained directly. Use the lens maker's equation, 1/f= 1/u + 1/v, to justify this method. 3. Define the terms (i) focal point & (ii) focal length, as applicable to a converging lens.
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