Convex lens

From Free net encyclopedia

Image:Large convex lens.jpg A convex lens, or converging lens, is a lens that is curved outward (convex): the ends are narrow and the middle is wide. Light passing through a convex lens is converged to a point. This point is also called a focal point. A convex lens can produce either a real or virtual image.

There are three kinds of rays drawn from an object, through the lens, and after the lens used to pinpoint focus of an image: Rays entering parallel to the axis will pass through the focal point on the image side of the lens. Light passing through the point one focal length from the lens along the axis will be diffracted so that it is parallel to the axis, and light passing through the center will not be diffracted at all.

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