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yes, focal lens length has three classifications

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Q: Does the focal lens length have three classifications?

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A lens of short focal length has a greater power (than a lens of large focal length)

The focal length of a lens is the distance from the principal foci to the center of the lens.

When the lens is cut vertically then the focal length of the lens will increase.the focal length will become approx double.

More the thickness, less the focal length.

Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm

focal length of the lens

The distance from the centre of the lens to the focal point.

The distance from the centre of the lens to the focal point.

There are three factors affecting the focal length of a lens. 1. refractive index of the material of lens. 2. refractive index of the surrounding medium 3. the radius of curvature of the lens surfaces.

Not at all. The focal length is determined by the curvature of the surfaces.

The eyepiece will have a shorter focal length than the objective lens has.

The size (diameter) of a lens does not determine its focal length. The amount of curvature of the lens does. Citing a diameter for a lens doesn't help us find the focal length. Lenses are ground to specifications that allow short or long focal length. The more curved the lens, the shorter the focal length. You can see this if we specify a given curvature and then start to "flatten" the lens. The focal length will get longer and longer as the lens is flattened. When the lens is flat (has to curvature) the lense has an infinite focal length, just like a piece of flat glass.

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