Question

The Power of convex lense is 8 diopter Calculate it's focal length​

Answer 1

Answer:

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Answer 2

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For example, suppose an object is at 1/2 meter. Converted to centimeters, the object is 50 cm away. Divide 100 by 50 and the result is 2 D of power needed to focus at this distance. The formula to remember is D = 100/F, where D is diopters and F is the focal length (or distance) in centimeters