Posted by Blegh on Thursday, November 1, 2012 at 11:16am.
Review and use the lens equation.
1/do + 1/di = 1/f
Candle height does not affect image position. Let x be the image location
1/50 + 1/x = 1/f = 1/15
1/x = 10/150 - 3/150 = 7/150
x = 150/7 = (one of your choices)
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