Question

how to calculate diopter and focal length I. e it's formula​

Answer 1

Answer:

The formula to remember is D = 100/F, where D is diopters and F is the focal length (or distance) in centimeters.

Explanation:

For example, if a lens has diopter +2, its focal length is 1000/2=500mm, and a lens of +4 diopter has focal length 1000/4 = 250mm.

hope you get it!!!!

Answer 2

Explanation:

1/f=p

we can also say that

1/p =f