What is meant by power of a lens? Write its si unit. A student uses a lens of focal length 40 cm another of -20cm.Write the nature and power of each lens?
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Answer:
the answer for the numerical sum is attached as a picture file
Explanation:
The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.
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