Question

A lens has power 4D, find the focal length that lens.


answer in detail.​

Answer 1

Answer:

f :- 0.25cm

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Answer 2

Answer:

answer is 0.25 cm

Explanation:

power of a lens =1/f

now by cross multiplication we get

focal length = 1/ power of a lens

focal length =1/4 =0.25 cm