A person standing in front of mirror found that his image is of same height this implies that the mirror is

Options

A. concave
B. plane
C. convex
D. either a or b

Explanation

To determine what type of mirror produces an image of the same height as the object, we can analyze the properties of different types of mirrors.

### Step-by-Step Solution:

1. **Understanding Image Formation**:
- When an object is placed in front of a mirror, the type of image formed depends on the type of mirror used. The image can be real or virtual, upright or inverted, and can vary in size.

2. **Identifying Types of Mirrors**:
- **Plane Mirror**: A plane mirror always produces a virtual image that is the same size as the object. The image is upright and located behind the mirror at the same distance as the object is in front of it.
- **Concave Mirror**: A concave mirror can produce an image of the same size as the object when the object is placed at the center of curvature. In this case, the image formed is real and inverted.
- **Convex Mirror**: A convex mirror always produces a virtual image that is smaller than the object, regardless of the object's position.

3. **Conclusion**:
- Since the person sees their image as being of the same height, this indicates that the mirror must be either a **plane mirror** or a **concave mirror** when the object is at the center of curvature. However, the most common scenario for seeing an image of the same height is with a plane mirror.

### Final Answer:
The mirror is a **plane mirror** (and it can also be a concave mirror if the object is at the center of curvature).

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