What type of mirror is most suitable as shaving glass?

Options

A. Plane mirror
B. Convex mirror
C. Concave mirror of large focal length
D. Concave mirror of small focal length

Answer

To determine the most suitable type of mirror for use as a shaving glass, we can analyze the properties of different types of mirrors and how they affect the image formation.

### Step-by-Step Solution:

1. **Identify the Types of Mirrors**:
- We have four options:
- Plain mirror
- Convex mirror
- Concave mirror of large focal length
- Concave mirror of small focal length

2. **Understand the Function of a Shaving Mirror**:
- A shaving mirror should provide a clear and enlarged image of the face to allow for precise shaving.

3. **Analyze Each Type of Mirror**:
- **Plain Mirror**:
- Produces a virtual image that is the same size as the object. It does not enlarge the image, which may not be ideal for shaving.
- **Convex Mirror**:
- Produces a virtual image that is smaller than the object. This is also not suitable for shaving as it does not provide a clear view of the face.
- **Concave Mirror of Large Focal Length**:
- When an object is placed between the focus and the mirror, it produces an erect and enlarged image. This is beneficial for shaving as it allows the user to see a larger view of their face.
- **Concave Mirror of Small Focal Length**:
- Similar to the large focal length concave mirror, it also produces an enlarged image. However, it may create a more distorted image if the object is too close.

4. **Select the Most Suitable Mirror**:
- The **concave mirror of large focal length** is the most suitable option because it provides a clear, erect, and enlarged image of the face, making it easier to shave accurately.

5. **Conclusion**:
- Therefore, the most suitable type of mirror for shaving is the **concave mirror of large focal length**.

### Final Answer:
The most suitable type of mirror as a shaving glass is a **concave mirror of large focal length**.

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