Question

A person needs a lens of power - 4.5 D for correction of his vision . What is the focal length of the corrective lens ?


(a)-22.2 cm

(b)-11.1 cm

(c)+ 22.2 cm

(d) -33.3 cm


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Answer 1

Answer:

b -11.1cm

Explanation:

-11.1.cm

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Answer 2

$- 11.1 \: cm \: is \: your \: answer \: \\ \infty$