Question

a) In what S.I unit is the power of lens stated? A convex lens has a focal length of 50 cm. calculate its power ¿​

Answer 1

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Dioptre is the SI unit for measuring the power of a lens.

= 100/50 = 2 dioptre.

Answer 2

The standard unit of power of lenses is Dioptres.

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Given,

Focal length = 50 cm = 0.5m

Power = 1/Focal length

Power = 1/0.5

Power = 2 D

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