The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.

In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower optical power) leads to higher magnification and a narrower angle of view; conversely, shorter focal length or higher optical power is associated with a wider angle of view. On the other hand, in applications such as microscopy in which magnification is achieved by bringing the object close to the lens, a shorter focal length (higher optical power) leads to higher magnification because the subject can be brought closer to the center of projection.

Determination of focal length of a convex lens

Determination of focal length of a convex lens

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Determination of focal length of a convex lens

Determination of focal length of a convex lens

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Determination of focal length of a convex lens

Determination of focal length of a convex lens

Determination of focal length of a convex lens

Determination of focal length of a convex lens

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Determination of focal length of a convex lens

Determination of focal length of a convex lens

Shah Jamal2nd Paper PracticalPracticalPhysics 2nd Paper Practical,Physics Practical,PracticalThe focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical...Shah Jamal's Online Classroom