## Answers

a) Given that u + v 120cm v Use the lens equati 120-u on zu V av f= 120-11) u(120-u) 120u-u' u(120-u) 15 = 15ー- 120 u-120u+1800- 0 Sove the quadratic equation 4- 102.426cm, uh -17.57cm Thus, the two positions of the lens for which the image is focussed on the screen are 17.57cm, 102.426cm b) The expression for the magnification (120-17.57) -10243 17.57 5.83 17.57 M1 -v,-(120-102.426-17.574 2, =-01715 102.426 102.426

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