[DOC] [TLE] Focal length - Wikipedia [PAR] 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 ... For a thin lens in air, the focal 
length is the distance from the center of the... [DOC] [TLE] Lens Basics [PAR] A lens with one flat surface is called plano-concave or plano-convex, ... thicker at 
its center than its edges it is called a converging lens (having positive focal length
). ... In these cases we speak of an object plane and an image plane, rather than 
... The distance from the focal point to the lens is defined to be the focal length of
... [DOC] [TLE] Experiment #6 Optics: Focal Length Of A Lens [PAR] (b) The focal point of a lens is found by allowing a bundle of mutually parallel 
rays to enter the lens (i.e., from ... The lens alters the direction of these rays, ... 
The converging lens is thicker at its center than at its edge. ... where f is focal 
length, do is the distance ... NOTE: Concave and Convex lenses have only one 
flat edge. [DOC] [TLE] Focal Point - Concave Lenses - CBakken Home Page [PAR] First, a concave lens is one which is thinner in the center than it is near the edges
. ... The distance from the lens to this point is called the focal length of the lens. [DOC] [TLE] Lenses and Geometrical Optics - Optics For Kids - The Optical ... [PAR] The distance, f, from the lens to the focal point is the focal length. ... The image, if 
there was one, would have been on the same side of the lens as the source (the 
light). ... Likewise, light bouncing off a convex mirror never converge, thus these 
... image: the ray (1) passing through the center of the lens will always travel in a
... [DOC] [TLE] Imaging with Lenses - Mount Holyoke College [PAR] A negative lens is one that causes incident parallel rays to emerge from the lens 
as ... The distance from the lens to the focal point is called the focal length, and 
considered ... The difference in these positions should be the focal length. ... 
Similarly q is measured from the center of the lens and is positive to the right of 
the lens,... [DOC] [TLE] Refraction and Lenses - Review Answers #2 - The Physics Classroom [PAR] ACT Test Center .... When an object is located inside of the focal point of a 
converging lens, the image will be ... An object is placed at a distance of 30.0 cm 
from a thin converging lens along its axis. The lens has a focal length of 10.0 cm. 
.... Diverging lenses only produce one type of image - a virtual image which is 
upright... [DOC] [TLE] What is the relationship between focal length and distance to the ... [PAR] Focal length of a lens is actually the distance between center point of the lens ... 
one can just symmetrically move the projection center along the focal axis by the 
... you need to recompute these parameters (such as focal length, coordinates of
... [DOC] [TLE] Thin lens equation and problem solving | Khan Academy [PAR] Aug 13, 2014 - 13 minThe focal length is the distance from the center of the lens to one of these focal points. Which ... [DOC] [TLE] Background Information - Convex Lenses - Galileo [PAR] A convex lens (figure 1) is one that is thicker at the middle than the ends and ... 
The focal length is the distance from the center of the lens to the focal point. ... 
Converging lenses in these orientations are used to project slides and motion... [DOC] [TLE] Chapter 36 [PAR] Images can be formed either by reflection or refraction due to these surfaces. 
Mirrors and ... One ray starts at point P, travels to Q and reflects back on itself. 
Another ray ... The distance from the mirror to the focal point is

Question: The focal length is the distance from the center of one of these to the focal point
Answer: the lens