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An object is 4.0 cm away from a concave mirror of focal length 20 cm. An image forms a distance s'
away from the mirror. What is s', the magnification m, and the type of image formed?
O s'= -5.0 cm, m = +1.25, real
Os' = +4.0 cm, m = -0.8, real
O s'= -4.0 cm, m = 0.8, virtual
O s' = +5.0 cm, m = -1.25, real
O s'= -5.0 cm, m = +1.25, virtual

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