Question

find the focal length of lens whose power is 1.5

Answer 1

this is your answer
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Answer 2

Here,

Given, P = 1.5 D

So, Power (P) = 1/f = 1/1.5

= 100/15 m

= 20/3

= 6.666666666666667 m

Therefor, the focal length of the lens is 6.666666666666667 m.