![]() Fully classify the images that are formed by each lens.Calculate the distance of the object from lens 1.The final image has a magnification of -10.75 and is 370 cm in front of Lens 1. Two convex lenses are placed 60 cm apart.Physics 139 - Physics for Optometrists Magnifying Glass An object is placed 40 cm in front of the first lens. M = M1M2Įxample Two converging lenses of focal length 20 cm and 30 cm, respectively are placed 100 cm apart. A image from one lens may be used as an object to a second lens.Provide interface for easy integration with web site or mobile app at affordable price. How much power does it use Answer: Known: Work done W 300 J, Time taken t 10 s. Problem 1: An electric machine makes use of 300 J of energy to do work in 10s. The standard metric unit of power is the Watt. It allows users to input, edit, print math equation or expressions. The Power Formula is used to compute the Power, Resistance, Voltage or current in an electrical circuit. In the Object type box, click Microsoft Equation 3.0, and then click OK. iMathEQ online mathematics equation editor or formula editor. In the Object dialog box, click the Create New tab. Formulas Real Power (P) VIcos, Watts (W) Reactive Power (Q) VIsin, Volt-amperes Reactive (VAr) Apparent Power (S) VI, Volt-amperes (VA) Power. Physics 139 - Physics for Optometrists Compound Lenses On the Insert tab, in the Text group, click Object. The above formulas have: V Application of a voltage across two. If we combine both first and second electrical power formula, we get: P V2R. We can calculate the power with the help of the following formulas. If one the first surface has a radius of curvature of 50 cm, what should be the curvature of the second surface? R = -0.9m We use power factor formula in electrical circuits. Since the lens is plano concave and hence diverging, its focal length is negative according to the Cartesian sign convention. A plastic lens (n = 1.40) of power 0.356 diopter is required to be manufactured. 1/f (n2/n1 1) (1/R1 1/R2) where ‘f’ is the focal length of the lens, R1 and R2 are its radii of curvature, n2 is its refractive index and n1 is the refractive index of the medium in which the lens is placed.All tools propose a report generation feature. Physics 139 - Physics for Optometrists Lens Maker’s Equation +14 cm R1 R2 + 32 cm Electrical calculation tools is a set of 7 computer aided online tools designed to help you. ![]() ![]()
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