Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity (considerable distance) in front of a convex lens. State three characteristics of the image so formed.

An object is placed at a distance equal to 2f in front of a convex lens. Draw a labeled ray diagram to show the formation of image. State two characteristics of the image formed.

Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.

What type of lens is shown in the diagram on the right ? What will happen to the parallel rays of light? Show by completing the ray diagram.

Your eye contains a convex lens. Why is it unwise to look at the sun?