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Concave Convex lenses

How are concave and convex lenses different? A convex lens is thicker in the middle compared to the edges. It is also called a converging lens because the rays and bent together. A convex lens is also called a positive lens because of the location of the focal point. A concave lens is thinner in the middle compared to the edges. It is called a diverging lens because the rays of light spread out. A concave lens also is called a negative lens because the focal point is behind the lens.