A doctor has prescribed a corrective lens of power +1.5D.
Find the focal length of the lens. Is the prescribed lens diverging of converging ?
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Answer:
We know that f = 1/P
where,
f is the focal length
p is power
f = 1/P
= 1/+ 1.5 = 0.67m
As the power of lens is (+ve) the lens is converging.
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