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Definition of Image:
An image is a likeness of an object that is at a location in space where it would seem to all observers as though the reflected light is coming from.
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Suppose you place a small light bulb in front of a concave mirror. Light rays extend from the bulb in all directions, many of which will approach the concave mirror. We refer to these rays as incident rays. Each incident ray reflects off the concave mirror according to the law of reflection. The reflected rays emerge from the concave mirror at different locations. Any observer in the room can see the image of the light bulb as the reflected light travels to their eyes. If every reflected ray is extended backwards from the eye of the observer toward the concave mirror, they will all intersect at the image location. The image location is the location in space where it would seem to all observers as though the reflected light is coming from.
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