Real image

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Top: The formation of a real image using a convex lens. Bottom: The formation of a real image using a concave mirror. In both diagrams, f  is the focal point, O  is the object and I  is the image. Solid blue lines indicate light rays. It can be seen that the image is formed by actual light rays and thus can form a visible image on a screen placed at the position of the image.
Top: The formation of a real image using a convex lens. Bottom: The formation of a real image using a concave mirror. In both diagrams, f  is the focal point, O  is the object and I  is the image. Solid blue lines indicate light rays. It can be seen that the image is formed by actual light rays and thus can form a visible image on a screen placed at the position of the image.

In optics, a real image is a representation of an actual object (source) formed by rays of light passing through the image. If a screen is placed in the plane of a real image it will generally become visible. A real image is the image obtained on a cinema screen.

Real images can be produced by concave mirrors and converging lenses.

When we see through a lens, or look into a convex or concave mirror, what we see is not a real image. This, the image that we see on the other side of the lens or mirror plane, is known as virtual image.

The real rays of light are always represented by full, solid lines.

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