Physics
posted by Carlos .
determine the image distance for an object that is 45.0 cm from a double convex lens having a focal length of 15.0 cm

Let the image distance be Di
1/45 + 1/Di = 1/15
1/Di = 2/45
Di = 22.5 cm
You do not need to know that the lens is double convex. All you need is the focal length.
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