Question

Calculate the power of lens of focal length is 2.5cm

Answer 1

Answer:

Explanation:

FOCAL LENGTH = 2.5 CM

POWER = 1/F

             = 1/2.5

             = 10/25

             = 2/5

             = 0.4.

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Answer 2

Answer: 40D

Explanation:

we know,

Power=100/focal length(in cms)

          =100/2.5

          =40D

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