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A plano convex lens of focal length 40 cms is silvered at plane surface. Find the focal length of arrangement after silvering.Let the refractive index of the lens be <Mu>The focal length of any resulting optic device can be found by letting parallel rays from infinity (parallel to the principal axis) fall on the device and finding where the image is formed.When the plane surface isn't silveredWhen parallel rays fall on the curved surface,u = -<alpha> Then by the refraction formula <Mu>/v - 1/ -<alpha> = (<Mu> -1)/R v =<Mu>R/(<Mu> -1)This serves as object for refraction at the plane surface.v' = v / <Mu> = R/(<
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submitted by elessar_iitkgp (2390 m) on 15 Jul 2007 21:55:08 IST (8 comments 514 views)
1. Find the moment of inertia of an equilateral triangle of side about its median.SolutionConsider a horizontal rod like element of thickness dx at a distance x from the base of the triangleWidth of that element = 2(l-x) tan30 = (2/3) (3L/2-x)Mass of that element = (4M/ 3 L2 ) (2/3) (3L/2-x) dxMI of this elemental rod dI = (1/12)[(4M/ 3 L2 ) (2/3) ((3L/2)-x) dx] [(2/ 3) ((3L/2)-x)]2 I = (8M/27 L2 )0L' ((3L/2)-x)3 dxwhere L' is the length of the medianL' = (3L/2)I = (1/24)ML22. Two bodies A and B are thrown upwards simultaneously with the same speed. The mass of A is greater than the mass of B. If air exerts a constant and equal
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submitted by elessar_iitkgp (2390 m) on 15 Jul 2007 17:11:36 IST (7 comments 582 views)
1. The gravitational force between two stones of mass 1 kg each separated by a distance of 1 meter in vacuum is (a) 6.675 × 10-5 newton (b) 6.675 × 10-11 newton (c) 6.675 × 10-8 newton (d) zero. 2. Circuit shown in the figure below contains two diodes each with a forward resistance of 50 ohm add with infinite backward resistance. If the battery voltage is 6V, then current through 100 ohm resistance is (a) 0.02 A (b) 0.03 A (c) 0.036 A (d) 0.0 A. 3. A rod is moving with speed 0.8 c with respec
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submitted by sauravagarwal (418 m) on 28 May 2007 09:54:52 IST (0 comments 172 views)
Newton's method From Wikipedia, the free encyclopedia (Redirected from Newton-Raphson method) Jump to: navigation, search In numerical analysis, Newton's method (also known as the Newton?Raphson method or the Newton?Fourier method) is an efficient algorithm for finding approximations to the zeros (or roots) of a real-valued function. As such, it is an example of a root-finding algorithm. It can also be used to find a minimum or maximum of such a function, by finding a zero in the function's first derivative, see Newton's method as an optimization algorithm. Contents [hide] 1 Description of the method2 Example3 History4 Practical consider
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submitted by rohith291991 (516 m) on 17 May 2007 23:14:46 IST (0 comments 123 views)
1. The gravitational force between two stones of mass 1 kg each separated by a distance of 1 meter in vacuum is (a) 6.675 × 10-5 newton (b) 6.675 × 10-11 newton (c) 6.675 × 10-8 newton (d) zero. 2. Circuit shown in the figure below contains two diodes each with a forward resistance of 50 ohm add with infinite backward resistance. If the battery voltage is 6V, then current through 100 ohm resistance is (a) 0.02 A (b) 0.03 A (c) 0.036 A (d) 0.0 A. 3. A rod is moving with speed 0.8 c with respec
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submitted by sauravagarwal (418 m) on 16 May 2007 11:12:10 IST (2 comments 165 views)
Introduction The problems and examinations in this physics course exercise not only your knowledge of physics but also your skill in solving problems. Professional physicists earn their salaries not particularly for their knowledge of physics but for their ability to solve workplace problems. This document presents tips for honing your problem solving skills. These tips and techniques will prove useful to you in your physics courses, in your other college courses, in your career, and in your everyday life. To set the stage, I want to discuss an example of problem solving from everyday life, namely building a jigsaw puzzle. There are a number of differen
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submitted by sauravagarwal (418 m) on 16 May 2007 10:20:36 IST (4 comments 178 views)
