An object is placed $5\,\mathrm{m}$ in front of a plane mirror. If a camera is used at the object's position to photograph the image, for what distance should the camera be focused?
A$5\,\mathrm{m}$
B$7.5\,\mathrm{m}$
C$10\,\mathrm{m}$
D$2.5\,\mathrm{m}$
Answer & Solution
Correct answer: C. $10\,\mathrm{m}$
In a plane mirror, the image forms as far behind the mirror as the object is in front of it. So the image is $5\,\mathrm{m}$ behind the mirror. The camera is $5\,\mathrm{m}$ in front of the mirror, so the camera-to-image distance is $5+5=10\,\mathrm{m}$.
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