A convex lens bends rays of light inwards as they pass through the lens. if the rays of light entering the lens are parallel, the rays will be brought to a focus at the focal point.
the greater the curvature of a lens, the more powerful it will be. so if two lenses are made of the same material, a highly curved lens will be more powerful that a flatter lens
you can calculate the power of the lens by the following
power of lens = 1 / focal length (metres)
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