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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Big Sean. Livin' the Don Life Set Me Back $180k! Big Sean is a bo$$ with shiny chains to flo$$ ... and the boss life ain't cheap. The rapper dropped $180k for two 50-carat diamond chains.