A converging lens of focal length 5cm forms a virtual ima...
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
2.0cm
3.3cm
5.0cm
10.0cm
15.0cm
Correct answer is B
f=uvu+v
5=−10u−10+u
50+5u=−10u
50=−10u−5u
u=50−15
u= -3.3cm
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