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What happens when the object is inside of the curvature of a spherical concave mirror
as shown? The procedure here will follow the two Light Ray Diagram rules that we
have successfully employed previously.
Ray Diagram Rules
1) Draw two light rays.
2) Choose the easiest two!
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To draw the first light ray, start at the top of the object. Draw a straight line to
middle of the mirror. Sketch the outgoing ray using the principle that the incident
reflection angles are equal.
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The second ray passes through the center of curvature. Begin at the top of the object
and draw through the center of curvature extending the line to the mirror surface.
Since the light ray is square with the mirror, the outgoing path traces over the
incoming path and on past the object. This light ray is shown in red.
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The top of the image is located where the light rays meet. This image is inverted and
enlarged. Note that this is a real image as real light rays focus to form the image.*
Go to next page.
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* If the object gets so close to the mirror that the image appears
upright, the image is no longer real but virtual.
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