Question

The focal length of a convex lens is

Answer 1

The focal length of a convex lens:

1. The focal length of a convex lens is the distance between the center of a lens and its focus.
2. Here, the rays of light traveling parallel to the principal axis converge at a point and the focus is called the real focus.
3. In a convex lens, the incident light always moves from left to right since the object is always on the lens’s left side.
4. All distances measured from the optical center of the lens to the right side are considered positive.

Therefore, the focal length of a convex lens is positive.