Find the focal length of lens of power 2d
Asked by admin @ in Science viewed by 322 People
Find the focal length of a lens of power , -2 D .what type of lens is this ??answer fast...
Answered by admin @
P=1/f(in m)
Now,
-2=1/f....
1=-2f .
1/-2=f..
therefore focal length will be 1/-2 m
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