Why is there a mirror inside an SLR?

All SLR cameras use a mirror and a penta prism model to reflect light through the camera body and the photographer can see the scene through the view finder. The below video demonstrates the light path through a SLR camera.

How SLR camera work

Since the light reflects of the mirror it gets the term Reflex. Combining the definitions based on how light enters and reflects its called a Single Lens Reflex or simply SLR.

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