Describe the nature of image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.

What is the nature of the image formed by a convex lens if the magnification produced by the lens is, - 0.5?

What is the position of image when an object is placed at a distance of 12 cm from a convex lens of focal length 12 cm?

At what distance from a converging lens of focal length 14 cm must an object be placed in order that an image of magnification 1 will be produced?

State and explain the New Cartesian Sign Convention for spherical lenses.