Question
You note that your prescription for new eyeglasses is $-4.50 \mathrm{D}$. What will their focal length be?
Step 1
The diopter (D) is the unit of measurement for the optical power of a lens, which is the reciprocal of the focal length (f) in meters. The formula to convert diopters to focal length is: \[ f = \frac{1}{D} \] Show more…
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You note that your prescription for new eyeglasses is –4.50 D. What will their focal length be?
You note that your prescription for new eyeglasses is -4.50 D. What will their focal length be?
You note that your prescription for new eyeglasses is $-4.50$ D. What will their focal length be?
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