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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In 2011, Forbes estimated Sean Combs net worth at $500 million, making him the richest figure in hip hop. Russell Simmons is a very successful American entrepreneur and co-founder of Def Jam. His personal net worth is reputed to be $500 million, officially reported at $325 million.