A conver lens forms a real image
at a distance of 18 cm when an
object is at 9 cm from its optic
centre. What is it's focal length?
plz answer fast thank you!!!!!
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Explanation:
f=-18
1/f=1/v+1 /u
1/f=1/18+(-1/9)
=1-2/18
=-1/18
f=-18
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