Two thin lenses,with focal lengths of 25.0 cm and -30.0 cm are placed in contact in an orientation so that their optic axes coincide.What is the focal length of the two in combination? {Hint: A thin lens is one whose thickness is negligible) .
A) -5.0 cm
B) 13.6 cm
C) 55.5 cm
D) 150 cm
Correct Answer:
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