what are the units of power of a lens?
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dioptre is the unit of lens
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Power is defined as work divided by time, so its units are joules/second. Scientists have another name for this unit, too. It's the watt, named after James Watt, the Scottish inventor who helped develop the steam engine that powered the Industrial Revolution. In the SI system, the watt is defined as:
1 watt = 1 J/s = 1 kg-m2/s3.
If you're measuring in the centimeters and grams, use this conversion:
1 watt = 107 ergs/s = 107 g-cm2/s3.
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