Question

calculate focal length of corrective lens having power +2.5D

Answer 1

Answer:

Focal length = 40 cm

Step-by-step explanation:

We know that P = 1/F where focal length is in metre.

So substitute the values in this formula and you get

2.5 = 1/F

F = 1/2.5

F = 0.4 m

Therefore F = 40 cm    ( 1 m = 100 cm )

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