Question

The shutter speed s, of a camera varies inversely as the square of the aperture setting f. When f= 8, s= 125, how do you calculate the value of s when f=4?

Answer 1

`s=250`

Explanation:

If two variables are inversely proportional, multiplying the two variables together would give a constant no matter how you change the two variables. That means that:

`f_1s_1=f_2s_2`

Plug into the values. Call `s_2` s:

`(8)(125)=(4)(s)`

Solve for `s`:

`s=250`