The above figure shows the formation of an image by a lens shown by a thick line (A) What is the type of lens used?

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:

A. What is the type of lens used? 

B. What is the nature of the image? 

C. 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

A. The lens is a convex lens. 

B. The image is virtual. 

C. Magnification for lens = v/u = h_i/h_o = 2 

−30cm/ u = 2 

Hence u = -15 cm