OPTI 201R, Fall 2005 Problem Set V Due September 26, 2005 09/19/05 1 of 2 V. 1What is the power of an equiconvex thin lens with 1R= 2R= +25, with an index of 1.5? V. 2A 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. 3A thin lens requires that the first radius (R1) be twice the value of the second radius (R2). If the required power is -10 diopters for an n=15, what is the value of the two radii? V. 4An equal, concave, thin lens (t = 0) has surfaces with a radius of 11 cm.R1 = R2= 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. 5A 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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