A candle is placed 15.0 cm in front of a convex mirror. When the convex mirror is replaced with
a plane mirror, the image moves 7.0 cm further away from the mirror. Find the focal length of
the convex mirror.
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Answer:
1/f=1/v-1/u
1/f=1/15.0-1/7.0
1/f=8/105
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