State the two laws of reflection of light.

If the object is moved further away from the mirror, what changes are there in the position and size of the image?

Explain what is meant by a virtual, magnified image.

State and define the S.I. unit of power of a lens.

A concave mirror and a convex lens are held separately in water. What changes, if any, do you expect in the focal length of either?

“A concave mirror of focal length ‘f’ can form a magnified erect as well as an inverted image of an object placed in front of it.” Justify this statement stating the position of the object with respect to the mirror in each case for obtaining these images.

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?

Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?

What is meant by:

1. Principal focus of a convex mirror.
2. Focal length of a convex mirror?

Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
Object is placed between device and its focus, image formed is enlarged and behind it.