Write a program to determine the focal length of a lens.
Focal length is the distance between the center of the lens to the principal foci. In order to determine the focal length of a lens we should know the distance between the lens and the image ( I ) and the distance between the lens and the object ( O ). Here, we will use the lens equation also called the focal length equation.
The lens equation is :
F is the focal length
I is the distance between the lens and the image
O is the distance between the lens and the object
Input : O = 50, I = 2 Output : F = 1.92308 Input : O = 25, I = 5 Output : F = 4.16667
Focal length of a lens is 1.92308 units .
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