to construct a ray diagram we use the paths of light rays that it is easy to know their distances after refractionfrom the lens. list these two rays

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Solution

Two rays for ray diagram:
1. When the incident light ray is parallel to the principal axis. Then the reflected ray will pass through the focus of a concave mirror.
2.When the incident light ray passes through the focus of a concave mirror. Then the reflected light will be parallel to the principal axis of the spherical mirror.

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