define focus of a concave mirror
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its between the centre of curvature and pole.
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A focus of a concave lens is very similar to a focal point of a concave mirror. Imagine many light rays pointed towards a lens, all parallel to each
other. When the light rays reach the lens, they will either all refract
away from each other or towards each other . In the convex case, the point the rays all
converge at is called the focus, and the distance from this point to the
lens is the focal length.
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