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. A convex mirror has a focal length of18 cm. The image of an object keptin front of the mirror is half the heightof the object. What is the distance ofthe object from the mirror?(Answer: 18 cm)

Answer»

M = H2= -V/U = 1/2 = -V = U/2 V = -4/2 1/V + 1/U = 1/F 1/-U/2 + 1/U = 1/18-2/U + 1/U = 1/18-U/U = 1/18U = -18U = 18cm



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