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 Wiki. Name: Michael Leonard Anderson Birth Date: March 25, 198 Birth Place: Detroit, Michigan, U.S. Age: 28 years Occupation: Rapper and singer Nationality: American Height: 1.73 m. Big Sean Net Worth. The Big Sean net worth is $12 Million. He is one of the popular and well known rapper in the United States. His popularity grew in the last few years. He is a rapper and model who received positive response from the audiences. The Big Sean salary details are not available but he is earning good enough through his work and concerts.