The smaller the focus of a convex lens, more its magnifying capacity, so why don't we use magnifying glasses with very small focal length?
A convex lens produces a magnification of +5. The object is placed : (a) at focus (b) between f and 2f (c) at less than f (d) beyond 2f
Draw ray diagrams showing the image formation by a convex lens when an object is placed (a) between optical centre and focus of the lens (b) between focus and twice the focal length of the lens (c) at twice the focal length of the lens (d) at infinity (e) at the focus of the lens