An optical device is an instrument that uses light for a purpose. The device that can focus light to a point through reflection is mirror.
What is reflection?
The reflection is the phenomenon of a light ray going back to the same medium after striking a surface.
The mirror is a one sided polished surface which reflects all the light falling on it. The reflected light after striking the mirror meets at a point forming the image of an object place in front of mirror. A mirror is an optical device that uses reflection phenomenon to focus light.
Thus, the device that can focus light to a point through reflection is mirror.
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