refraction in lens

A lens which is thicker in the middle and thinner at the edges is called a convex lens. In a convex lens at least one of its surfaces is bulging out at the middle. According to their shapes the convex lenses are classified as bi-convex or double convex convexo - plano ..

The relationship between distance of the object (u), distance of the image (v) and focal length (f) of the lens is called lens formula or lens equation. -------- Lens formula This lens formula is applicable to both convex and concave lenses. ..

Whenever a ray of light passes through a lens (except when it passes through the optical centre) it bends. The bending of light rays towards the principal axis is called convergence and bending of light rays away from the principal axis is called divergence. The degree of convergence or ..

A lens which is thicker in the middle and thinner at the edges is called a convex lens. In a convex lens at least one of its surfaces is bulging out at the middle. According to their shapes the convex lenses are classified as bi-convex or double convex lens..

A lens which is thinner at the middle and thicker at the edges is called a concave lens. Like convex lenses these lenses are also classified as bi-concave concave - plano concavo - conv..

Let AB represent an object placed at right angles to the principal axis at a distance greater than the focal length f of the convex lens. The image A 1 B 1 is formed between O and F 1 on the same side as the object is kept and the image is erect and virtual. OF 1 = Focal length = f OA = O..

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It is a relation that connects focal length of a lens to radii of curvature of the two surfaces of the lens and refractive index of the material of the lens..

When an object is placed in front of a lens, light rays coming from the object fall on the lens and get refracted. The refracted rays produce an image at a point where they intersect or appear to intersect each other. The formation of images by lenses is usu..