An object 50 cm tall is placed on the principle axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal lengths of the lens.

An object is kept at 10 cm in front of a convex lens. Its imge is formed on the screen at 15 cm from the lens. Calculate the focal length of the lens.

A 5 cm tall object is placed on the principal axis of convex lens of focal length 50 cm at a distance of 40 cm from it. Find the nature, position and size of the image.

The focal length of convex lens is 20 cm. If an object of height 4 cm is placed at a distance of 30 cm from the lens, find: The height of the image

The focal length of convex lens is 20 cm. If an object of height 4 cm is placed at a distance of 30 cm from the lens, find: The magnification produced by the lens.