Question

A concave lens has focal length 15cm.At what distance should the object from the lens be placed so that it forms an image 10cm from the lens​

Answer 1

Answer:

Solution : Here, focal length of concave lens, f=-15cm. object distance, u=?, image distance, v=-10cm, magnification of lens, m=? Thus the object should be placed at a distance of 30 cm on the left side of the concave lens.