Describe the formation of real and virtual images by a convex lens with the help of diagrams at different positions of the object.

Describe the formation of image by a concave lens.

A convex lens forms a virtual image of an object. What is the position of the object?

Differentiate between a real image and a virtual image.

Give the nature, position and size of the image formed by a convex lens when the object lies at 2 F

Which type of lens forms always a virtual image?

Explain the sketches the formation of a virtual image in the case of a concave mirror.

Explain with the help of a diagram the formation of image formed by a plane mirror.

A screen is placed 80 cm from an object. The image of the object on the screen is formed by a convex lens placed between them at two different locations separated by a distance 20 cm. Determine the focal length of the lens.