Draw ray diagrams showing the image formation by a convex mirror when an object is placed:
At finite distance from the mirror.

Show the lateral displacement of the ray on the diagram.

What is the position of the image when an object is placed at a distance of 20cm from a concave mirror of focal length 20cm?

To find the image distance for varying object distances in case of a convex lens of focal length 15 cm, a student obtains on a screen a sharp image of a bright object by placing it at 20 cm distance from the lens. After that he gradually moves the object away from the lens and each time focuses the image on the screen.

1. In which direction-towards or away from the lens does he move the screen to focus the object?
2. How does the size of image change?
3. Approximately at what distance does he obtain the image of magnification -1?
4. How does the intensity of image change as the object moves farther and farther away from the lens?

What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?

What kind of lens can form:

1. An inverted magnified image?
2. An erect magnified image?
3. An inverted diminished image?
4. An erect diminished image?

List four properties of the image formed by a plane mirror.

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?

A large concave mirror has a radius of curvature of 1.5m. A person stands 10m in front of the mirror. Where is the person’s image?

Explain with the help of a diagram, why the convex lens is also called a converging lens.