Homework Help: Physics

Posted by Emily on Thursday, May 27, 2010 at 12:19am.

An image of a candle is produced by a convex lens 14 cm away. If the focal length of the lens is 7 cm, how far from the lens is the candle placed?
(USe the thin lens equation)
For this question, how would you know whether the image is virtual or real?(in order to know if the distance to the mirror is negative or positive)

Physics - drwls, Thursday, May 27, 2010 at 7:03am
Solve
1/do + 1/di = 1/do + 1/14 = 1/f = 1/7

The answer is that the object distance is (do) = 14. You get a 1:1 real image.

The image is real because do is positive.

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