Question

A plane mirror reflects a beam of light to form a real image. The incident beam is :

• A. parallel
• B. convergent
• C. divergent
• D. any one of the above

Answer 1

The correct option is B convergent


A convergent light beam can do this.
So the answer is "convergent".
You should be able to show this by drawing a "ray diagram" for the light beam. The reflected rays converge and that's what's needed to produce a real image.

A "real object" always produces a "virtual image" in a plane mirror. That's because the reflected rays diverge.
Interestingly, a plane mirror can form a real image if the object itself is virtual.
i.e. rays are convergent.