One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

Focal length of a convex lens is 15cm. Where should an object be placed so that real and three times larger image is formed?

The distance between an object and a screen is 3 metre. What is the power of a lens which can produce an image twice the size of the object when placed in between the lens and the screen.

A mass of 10 kg is a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

An object is placed at the focus of Convex lens. Where will the image be formed?

When an object moves towards a convex lens, the size of the image decreases.

An object is kept at 0.2 m from a convex lens of focal length 0.15 m. Find the position of the image formed.