Lenses and distance of images
(a) How far from a 51.4 mm focal-length lens must an object be placed if its image is to be magnified 2.50 and be real?
(b) What if the image is to be virtual and magnified 2.50?
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How far from a 51.4 mm focal-length lens must an object be placed if its image is to be magnified 2.50 and be real?
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