1.

A converging lens has focal length of 12cm. Calculate at Widdistance should the object be placed from the lens so that it formsan image at 48cm on the other side of the lens.

Answer»

Focal length of convex lens f = 12 cmImage distance v = 48 cmObject distance u = ?

Lens formula:1/f = 1/v - 1/u1/u = 1/v - 1/f = 1/48 - 1/12 = -1/16 u = -16 cmThe object should be placed at a distance of 16 cm from the lens to obtain an image at 48 cm on the other side of the lens.



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