Which of the following statements is FALSE?
1. Focal length of a convex lens is positive.
2. Focal length of a concave lens is negative.
3. All measurements to the right of the optic centre are positive.
4. All measurements to the left of the optic centre are positive.1
Statement 2 only
2
Statement 3 only
3
Statement 4 only
4
Statement 1 only