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Physics, 01.04.2020 17:28 thebasedgodchri

A mirror has an object located on its principal axis 40.0 cm from the mirror's surface. A virtual image is formed 15.0 cm behind
the mirror. What is the mirror's focal length?
a. -240 cm
C. 2.38 cm
b. -10.9 cm
d. 13 cm

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