Concave mirrors bend inward from a flat plane, bending into a middle point, like a hole – or cave entrance – extending away from the viewer. Reflections in a concave mirror can be real images, meaning they are projected outward, in front of the mirror, appear to be floating, and can be viewed even without looking into the mirror; or the images can be virtual and appear only inside the mirror. The kind of reflection the mirror provides depends on the distance between the object and the mirror. Concave mirrors are used in reflecting telescopes, spotlights, and laser construction.

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