When converging beam incident on plane mirror, real image is formed as shown 

Mirror and the Reflection of Light

Mirror and its Types:
- A mirror is a smooth, polished surface that reflects light.
- There are two types of mirrors: plane mirrors and curved mirrors.
- In this question, we are specifically referring to a plane mirror.

Plane Mirror:
- A plane mirror is a flat mirror with a smooth, reflective surface.
- It reflects light by the law of reflection, which states that the angle of incidence is equal to the angle of reflection.

Reflection of Light:
- When light falls on a mirror, it bounces off the mirror's surface and forms an image.
- The image formed by a plane mirror is virtual, erect, and laterally inverted.
- The virtual image appears to be behind the mirror, and it cannot be projected onto a screen.

Types of Images Formed by a Mirror:
- There are two types of images formed by a mirror: real and virtual.
- A real image is formed when light rays actually converge at a point after reflection.
- A virtual image is formed when light rays appear to diverge from a point after reflection.

Pencil of Light and the Image Formed:
- In this question, the pencil of light is incident on the plane mirror.
- The pencil of light refers to a group of parallel light rays.
- When a pencil of light is incident on a plane mirror, it reflects in such a way that the reflected rays appear to converge at a point.
- This convergence of light rays indicates that a real image is formed.

Answer Explanation:
- The question asks which type of pencil of light incident on the mirror forms a real image.
- Among the given options, option 'B' - convergent - is the correct answer.
- A convergent pencil of light refers to a group of light rays that converge at a point after reflection.
- When a pencil of light is convergent, it forms a real image.
- On the other hand, a parallel pencil of light does not converge and forms a virtual image.
- Therefore, the correct answer is option 'B' - Convergent.