Concave mirror is used in head light of vehicles asA.It reflects the parallel beam of lightB.It is easy to useC.It can be easily cleanedD.It forms the strong beam of light

A concave mirror is used in the headlight of vehicles because:

1. It reflects the parallel beam of light: Concave mirrors have a curved surface that can reflect light rays in a way that they converge at a single point called the focal point. This property allows the concave mirror to reflect parallel beams of light, such as those emitted by the headlight, and focus them into a concentrated beam.

2. It forms a strong beam of light: By reflecting and converging the parallel beams of light, the concave mirror helps to create a strong and focused beam of light. This is important for headlights as it enhances visibility and allows drivers to see better in dark or low-light conditions.

3. It is easy to use: Concave mirrors are relatively simple to install and use in the headlight assembly of vehicles. They can be easily positioned and adjusted to achieve the desired beam direction and focus.

4. It can be easily cleaned: Concave mirrors can be cleaned easily, which is important for maintaining the efficiency and effectiveness of the headlight. Regular cleaning helps to remove dirt, dust, and other particles that may accumulate on the mirror's surface and hinder the proper reflection of light.

Therefore, the correct answer is A. It reflects the parallel beam of light.