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You stand on the end of a diving board and bounce to set it into oscillation. You find a maximum response in terms of the amplitude of oscillation of the end of the board when you bounce at frequency f. You now move to the middle of the board and repeat the experiment. Is the resonance frequency for forced oscillations at this point higher, lower, or the same as f?

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    a concave mirror forms a real image at distance of 25cm for an object distance of 50cm .Calculate the magnification produced by the mirror

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