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Nature, position and size of the image formedWhen an object is placed 20 cm from a concave mirror, a real image magnified three times is formed. Finda) the focal length of the mirrorof Where must the object be placed to give a virtual image three times the height of the object?Dentist's mirror has a radius of curvature of 3 cm. How far must it be placed from a small dental cavity |
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