Question

In the situation shown the lens has a focal length -10 cm and the mirror has curvature radius +20 cm. The distance between adjacent dots on the diagram is 10 cm. An object is placed as shown 15 cm in front of the mirror. a) Use the formulas to locate the image formed by the mirror and the image subsequently formed by the lens. (Ignore the image formed directly by the lens.) Calculate the magnification of the final image relative to the object. b) Draw principal rays (at least two) to locate the image formed by the mirror. c) Using this as the object for the lens, locate the final image by drawing at least two principal rays.

Answer 1

a) For minor → fa = 200m = 10 cm → f= +10 cm do = +15cm a = jó di =+30 cm (in front of minor) Distance between mirror & lens = 4x10 cm = 40 cm For lens → fa-lo cm, do = +40-30)cm = +10 cm » di = -5cm d net. magnification , m=m, x m2 mirror, m = -di = - 300 = -2 lens, me = -dj =-(-5) = 0.5 m=m, xm, = -2 X 0.5 m = -1