which has more power: a thick convex lens or a thin concave lens made up of the same glass? give reason for your choice.
Which lens has more power : a thick lens or a thin lens ?
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed : (a) at 2F1, (b) between F1 and the optical centre O of the lens. Which of the above two cases shows the use of the convex lens as a magnifying glass ? Give reasons for your choice.