Four statements about rays used in standard ray diagrams for a convex lens are listed below:
1. A ray through the optical centre passes straight without deviation.
2. A ray parallel to the principal axis after refraction passes through the focal point on the other side.
3. A ray passing through the focal point before reaching the lens emerges parallel to the principal axis.
4. A ray parallel to the principal axis emerges parallel to the principal axis on the same side of the lens.
Which statement is INCORRECT?
a) Only 1
b) Only 2
c) Only 4
d) Only 3