How does a camera lenses works?=P?

Lenses work because light bounces off of everything and heads away from those things in straight lines. Then glass (what the lens is made of) has a different refraction index, meaning that as the light goes from the air to the glass, it bends slightly. The same effect can be seen with water, where peoples legs look strange underwater in a pool, like they're attached at the wrong angle or appear shorter than they should.

As it turns out, different kinds of glass have different refraction indexes as well. By making the various elements in a lens from different kinds of glass, a very sharp focus can be achieved at the film plane. And the different shapes of the elements, along with how many there are and how they are spaced, results in the angle of view of the lens, from "wide angle" to "telephoto". Then lenses with very complex arrangements of elements, with some moving, are zoom lenses.

Hope this helps.

-Karl

They focus the light reflected off a subject and focus it on the film (sensor). All lenses do this. Some magnify the image (telephoto lenses) and other "see" up to 180 degrees of the view in front of the camera

Some has a 220掳 angle of view.
http://www.photosynthesis.co.nz/nikon/ai...

A modern camera lens actual consists of a number of lenses. These are called elements. Think of a series of magnifying lenses with different focal lengths.

In a non-zoom lens, called a fixed lens by some, turning the focus wheel focuses the faraway image onto the film plane (or digital sensor if it is a digital camera). You can try the same with magnifying lens.

In a zoom lens, there are a lot more elements because not only will the lens need to be able to focus, but also it must work like a telescope to enlarge the image. Something you can also try with the magnifying lens.

I hope that helps.