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PS5_2005 - OPTI 201R Fall 2005 V 1 Problem Set V Due What...

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OPTI 201R, Fall 2005 Problem Set V Due September 26, 2005 09/19/05 1 of 2 V. 1 What is the power of an equiconvex thin lens with 1 R = 2 R = +25, with an index of 1.5? V. 2 A negative thin lens of 5 diopters (-) has an object placed 40 cm in front of it. a) What is the transverse magnification? b) Is the image real or virtual? V. 3 A thin lens requires that the first radius (R 1 ) be twice the value of the second radius (R 2 ). If the required power is -10 diopters for an n=15, what is the value of the two radii? V. 4 An equal, concave, thin lens (t = 0) has surfaces with a radius of 11 cm. R 1 = R 2 = 11cm a) What is its power? b) What is the value of the front and back focal length (f and f*)? c) Make a sketch and locate the f, f*. V. 5 A negative lens has a back focal length of –100 mm and a diameter of 20 mm. a) Where is the image of a 5 mm object placed in front of the lens at 100
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