We say that the focal length of a lens is half times the radius of curvature, right. Now, consider any lens(say convex), made of any material(say glass). Now a beam of light parallel to the principle axis, passes through the lens. All the rays in the beam will converge at a point, which we call the focus. For now, let us assume that the focal length of this particular lens is half time the radius of curvature of the lens. Now, take another lens whose structure is identical to that of the previous lens, i.e., it has the same radius of curvature and everything, the only difference being that this time the lens is made of a material that is denser than that of the previous lens. This time, if we pass a beam of light parallel to the principle axis through the lens, all the rays in the beam will converge at a different focus, with focal length shorter than that in case of the previous lens. So, we can see that, 2F is not=R.PLEAZZZZZZ COMMENT
2f = r applies to a spherical concave mirror (see ref.), not a lens. Maybe that's the source of your confusion.
It's not in the thin-lens formula either, although that formula does lead to one special case involving 2f; with a converging lens, when the object is at distance 2f from the lens, the real image is at the same distance.
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The ion beam probe characteristics such as, lateral resolution, chromatic aberration and beam current stability are basic requirements for good nuclear microscopy. To be able to deliver ion beams on target with the right conditions for micro analytical work in addition to an optimal object, quadrupole lens and scanning coil setup, the optimisation of accelerator optics parameters is required to be able obtain adequate operational properties for the ion beam. Recently a new generation of ion accelerating machines, designed for nuclear microscopy are provide with a better microprocessor control over the optics of the accelerator. This on the other hand helps to maintain an optimal beam probe for high resolution at target surface. Author: M. Eisa, Mohamed Eltayeb Binding Type: Paperback Number of Pages: 232 Publication Date: 2009/10/20 Language: English Dimensions: 5.98 x 9.01 x 0.52 inches
Optics gives a comprehensive and balanced account of traditional optics as well as some of the recent developments in this field while meeting the requirements of a course on optics meant for undergraduate students of science and engineering.
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left or right brain
Why can't I close my left eye without closing my right eye when I look down optics?
I'm right handed, but I shoot left handed. I do this because when I shoot right handed I can't see through the scope. I can close my right eye and still keep the left eye open and I can even keep both eyes open when shooting left handed. However, when I try to do it shooting right handed, my eyes hurt and I can't see through the scope with both eyes open. Bottomline, I can see through a scope or rangefinder when I use my left eye to look through the scope, but I can't when I shoot right handed. I can't figure it out. I have a stigmatism in my left eye and I wear glasses. Any ideas?
Definitely sounds like you're cross-dominant. Right handed but left eye is dominant. If you are comfortable and accurate shooting left handed stick with it. In Hunter Education classes we teach that it is always best to shoot in accordance with your dominant eye, rather than with whether you are left or right handed. We also teach that you should always shoot with both eyes open, whether using a scope, open sights, or a shotgun bead.
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