Question

the focal length of a convex lens is 10 CM where should an image be placed to get (a) a real image (b) a virtual image twice the size of object ​

Answer 1

Answer:

Calculate the distance at which an object should be placed in front of a convex lens of focal length 10 cm to obtain a virtual image of double its size. Solution : Here, u=?,f=10cm,m=+2, as image is virtual. Therefore, object should be placed at a distance of 5 cm from the lens