# Determination of focal length of a convex lens

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*

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

http://teachingbd24.com/determination-of-focal-length-of-a-convex-lens/2nd 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 JamalShah Jamalsjamal59@gmail.comAdministratorI'm an assistant professor of Physics, Head of the department, in BAF Shaheen College Dhaka since 1984. I'm almost 30 years in the profession of teaching. If you have benefited from my website, please consider to sharing it among your friends.Teaching BD
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