Question

Find the power of a concave lens of focal length 2 m.
what is 'D'​

Answer 1

D is the Si unit of power "Dioptre"

D = 1/ focal length in metres

Therefore D = 1/2 = 0.5 D

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Answer 2

Answer:

we know power of lens = 1/focal lenght

so p= 1/100/20 cm convert Metre to centimeter

so power 5D