A concave lens is thinner at the centre than at the edges. Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens. When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length.
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How tall is Sean Hannity. Rate. Sean Hannity is an American radio and television host, author, and conservative political commentator. His nationally syndicated radio program, The Sean Hannity Show, airs throughout the United States on Citadel Media.