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At what distance should an object be placed from a lens of focal length 25 cm to obtain its image on a screen placed on the other side at a distance of 50

cm from the lens? What will be the magnification produced in this case?


 Given that, Focal length, f = 25 cm Image distance, v = 50 cm Form the lens formula, Or, u = −50 cm Magnification, The object must be placed 50 cm away from the lens, on the other side to produce a magnification of −1.
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