what is focal length of lens of power -1.5d
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1
P=1/f implies f=1/p =1/1.5=0.666 here the focal length can never become negative
rahul200013:
nope focal length can be negative....if the focal length is measure left to the lens
U r right
Answered by
2
Power P=1/f
hence, f=1/P
Given that, P=-1.5D
therefore focal length of the lens:-
=1/-1.5
=-0.6667 m
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