Dioptres are used to measure the optical power of a lens or mirror. You can learn more about Dioptres online at the Wikipedia website. Once on the page, type "Dioptre" into the search field at the top of the page and press enter to bring up the information.
Dioptre /4 =Power. Thus 12 /4 =3x magnification
The power of a lens is measured in dioptres which is the reciprocal of the focal length in metres. A 5-dioptre lens would allow you to see something at a distance of 20 cm, while a 20-dioptre lens would allow the object to be seen from 5 cm (2 inches) so it would be more effective as a magnifying glass. Your arms are short.
The dioptre, which is equal to 1/meter.
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Reciprocal of focal length is the power P = 1/f and it's measured in dioptre (D).
Reciprocal of focal length is the power P = 1/f and it's measured in dioptre (D).
They would use bottled air.
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