Which of the following are not uses of concave mirror:

Options

A. In search lights
B. In vehicle head lights
C. As rear view mirro
D. As shaving mirror

Explanation

To determine which of the following options are not uses of a concave mirror, let's analyze each option provided:

1. **Searchlight**: Concave mirrors are commonly used in searchlights. They focus light into a beam, making them effective for illuminating large areas.

2. **Vehicle Headlights**: Similar to searchlights, concave mirrors are utilized in vehicle headlights to direct and focus light, providing better visibility on the road.

3. **Rear View Mirror**: Concave mirrors are not used as rear view mirrors in vehicles. This is because they produce an inverted image of distant objects, which is not practical for viewing traffic behind the vehicle.

4. **Shaving Mirror**: Concave mirrors are often used as shaving mirrors because they create a magnified image of the face, allowing for a closer and clearer view.

Based on the analysis above, the option that is not a use of a concave mirror is the **Rear View Mirror**.

### Step-by-Step Solution:
1. **Identify the Uses of Concave Mirrors**:
- Searchlights: Used to focus light.
- Vehicle Headlights: Used to direct light.
- Rear View Mirror: Not used due to image inversion.
- Shaving Mirror: Used for magnification.

2. **Evaluate Each Option**:
- Searchlight: Valid use.
- Vehicle Headlight: Valid use.
- Rear View Mirror: Invalid use (produces inverted images).
- Shaving Mirror: Valid use.

3. **Conclusion**: The option that is not a use of a concave mirror is the Rear View Mirror.