Question

The above figure shows the formation of an image by a lens shown by a thick line.

Analyse the figure and answer the following questions.

1. What is the type of lens used?
2. What is the nature of the image?
3. If the image is formed at a distance of 30 cm from the lens and the image is twice the size of the object, then where is the object placed?

Answer 1

1. The lens is a convex lens.
2. The image is virtual.
3. Magnification for lens = `v/u = (h_i)/(h_o) = 2`
   `(-30 cm)/u = 2`
   Hence u = −15 cm.