Thin Lenses: An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm. Where is the image of this object located?
A. 60 cm to the right of the lens
B. 60 cm to the left of the lens
C. 8.6 cm to the right of the lens
D. 8.6 cm to the left of the lens
E. 30 cm to the left of the lens
Answer: B
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