When light is incident through the focal point and allow to strike a mirror, the light will be reflected back parallel to the principal axis.
What is reflection of light?
The reflection of light occurs when all the incident light falls back when it hit a plane surface like mirror. In this process the light will be thrown back by the mirror without absorbing it.
Reflection of light when it strikes a mirror
When light is incident through the focal point and allow to strike a mirror, the light will be reflected back parallel to the principal axis.
Thus, the incident light will reflect parallel to the principal axis.
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