find the focal length of a lens of power -5.0D.What type of lens is this
Pls answer soon.....
Answers
Answered by
22
P = -5.0D
f=1/P
=-1/5.0
=-0.2
F=-0.2
Answered by
3
Given,
The power of the given lens is -5.0D
To find,
The focal length of the given lens.
Solution,
We have to calculate the focal length of the given lens by using the following mathematical formula,
Power of the lens = 1/focal length of the lens
P = 1/f
-5 = 1/f
-5f = 1
f = 1/-5
f = -0.2
Hence,the focal length of the lens is -0.2 metres.
_________________________________________
As mentioned in the previous calculation,the given lens has a negative focal length and that's why the given lens is a concave lens. Only concave lenses have negative focal lengths.
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