The lens formula relating the image distance, p , to the focal length, f , and object distance, s , is
The magnification of a lens is
A magnifying glass with focal length 15 cm is placed 10 cm above a stamp. The magnification of the magnifying glass in is
A) +3.
B) -3.
C) +15.
D) -15.
E) +30.
Correct Answer:
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