The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall `3 m` away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose ?

The graps shows the variation of magnification m produced by as convex lens with the image distance v . The focal length of the lens is

What is the power of a convex lens of focal length 0.5 m?

A man is sitting in a room at 2m from a wall W_1 , wants to see the full height of the wall W_2 behind him 4m high and 6m away from the facing wall W_1 . What is the minimum vertical length of mirror on the facing wall required for the purpose?

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex leng. The lens is placed at a distance d ahead of second wall, then the required focal length will be:

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the :

The distance between the object and the real image formed by a convex lens is d. If the linear magnification is m, find the focal length of the lens in terms of d and m.