State any two uses of convex lenses.

What type of lens would you use as a magnifying glass? How close must the object be to the lens?

Name two factors on which the focal length of a lens depends.

Fill in the following blanks with suitable words:

(a) _______ rays of light are refracted by a convex lens to a point called the focus.

(b) The image in a convex lens depends upon the distance of the object from the______.

What is a lens? Distinguish between a convex lens and a concave lens. Which of the two is a converging lens: convex lens or concave lens?