The diagram shows parallel rays of light approaching a concave mirror - Leaving Cert Physics - Question (c) - 2007

To accurately depict the paths of rays of light after they strike a concave mirror, follow these steps:

1. Diagram Setup: First, replicate the provided diagram, ensuring the concave mirror is placed correctly, with the focal point (F) marked on the principal axis.

2. Draw the Incoming Rays: Draw two or three parallel lines approaching the mirror from the left side. These represent the rays of light coming in parallel toward the concave mirror.

3. Identify the Focus: Establish where the focal point (F) is located in front of the mirror. This is typically halfway between the vertex of the mirror and the center of curvature.

4. Reflection Paths: For each incoming ray:

   • First Ray: A ray parallel to the principal axis will reflect through the focal point (F) after striking the mirror. Draw this reflected ray curving towards the focal point.
   • Second Ray: A ray passing through the focal point before it strikes the mirror will reflect and run parallel to the principal axis after the reflection. Draw this path accordingly.

5. Final Adjustment: Ensure that the angles of incidence and reflection are consistent, adhering to the law of reflection (i.e., the angle of incidence equals the angle of reflection).

By following these steps, you should clearly illustrate the behavior of light rays reflecting off a concave mirror.