Question

The ray diagram showing the correct path of the ray after passing through the lens is:

• A. II and III only
• B. I and II only
• C. I, II and III
• D. I, II and IV

Answer 1

The correct option is C I, II and III

There are some special rays which follow a fixed pattern on passing through a convex lens:

• A ray of light parallel to the principal axis passes through the principal focus on the other side.
• A ray passing through principal focus will emerge parallel to the principal axis.
• A ray passing through the optical centre of a lens will emerge without any deviation.

Hence, image I, II, and III are the correct representations of the ray diagram.