BRAINCAKEConvex Lenses
A convex lens is thicker at its centre than at its edges. It is a converging lens: it brings light rays together.
Rays parallel to the principal axis are refracted by the lens and meet at a point on the axis on the other side, the principal focus F. Rays really pass through this point, so it is a real focus. The distance from the optical centre of the lens to F is the focal length f, which is positive in the real is positive convention. A lens has a principal focus on each side, the same distance from the centre.
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More in Optics
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All 21 lessons in Optics · All Edexcel AS-level Physics topics