If all rays falling on a convex lens are parallel to the principal axis of the lens, what happens to them after they pass through the lens?

Q. If all rays falling on a concave lens are parallel to the principal axis of the lens, what happens to them after they pass through the lens?

Q.

In a convex lens, ray parallel to the principal axis after refraction passes through which of the following?

Q. The light rays parallel to the principal axis meet at point M after passing through a convex lens. What is the power of the lens?

Q. A parallel beam of light rays travelling parallel to principal axis after passing through the lens actually meet. This phenomena happens for which type of lens?

Q. A ray of light coming parallel to the principal axis after passing through a convex lens, passes through its