An excellent real-world example of a biconvex lens is the human eye. For our eyes to focus on nearby objects, the light rays from these objects must be bent sharply to bring them into focus on the retina; the light rays from distant objects require less refraction. The lens in our eyes is highly flexible, allowing its shape to change and adjust the level of convexity. The more convex the lens, the greater the refraction.

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Biconvex lenses are symmetrical, with equal radii on both sides. They are often used for virtual imaging of real objects and for a positive conjugate ratio between 0.2 – 5.

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In a biconvex lens or a Plano-convex lens, a beam of light that is parallel to the lens axis passes through the lens and converges to a point behind the lens. This point is known as the focus of the lens. The distance from the lens to the focus is known as the focal length of the lens. As there are two curved surfaces, there are also two focal points and two centres. The line drawn through the centre of the lens is known as the principal axis. This is illustrated in the figure below-

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Biconvex lenses are a form of simple lens and have a multitude of applications. They are used in a variety of settings, including laser beam control and focusing, imaging, and other optical instruments.

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In conclusion, a biconvex lens is an incredibly useful tool when dealing with light that is diverging and needs to be made to converge symmetrically.

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A biconvex lens is a simple optical device comprised of two outwardly curving, or convex, surfaces. Typically, these surfaces share the same radius of curvature, giving the lens its unique double-convex shape. In some circles, these lenses are also referred to as convex-convex lenses.

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