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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 May 2007 16:13:19 IST
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The method is as follows. The combined focal length of the lenses alone is reciprocal of (- 1/ 10 + 1/ 20). Focal length of the mirror is given by f = 20 ( 3/2 -1) / 2.
Therefore the combined focal length is given by the reciprocal of -1/10 + 1/ 5 = 1/ 10. Therefore the answer is 10 cm but it is positive.
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