Multiple Choice
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:

Verified
Correct Answer:
Verified
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