Question

Find the focal length of a lens of power -2.0D. What type of lens is this?

Answer 1

There is one formula 1/f in mts

Answer 2

P = 1/f

where p is power

f is focal length

therefore -2.0= 1/f

-2.0 × f = 1

f = -1/2.0

f = -0.5

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