The image obtained with a convex lens is...

The image obtained with a convex lens is erect and its length is `4` times the length of the object. If the focal length of lens is `20 cm`, calculate the object and image distances.

u = 60cm, v = 15 cm

u = 20cm, v = 10 cm

u = 10cm, v = 20 cm

u = 15cm, v = 60 cm

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