You take a picture under following conditions. f/2, ss 1/1000 seconds, light source 1.75 m away. You change the f # to f/4 and the shutter speed to 1/125 seconds. 1.) How many f-stops did you change?

2.) Just for the f-stop change, your exposure changed by what factor? Use a fraction if amount of light decreased.

3.) By what factor did you change the shutter speed?

4.) Just for the shutter speed change, your exposure changed by what factor? Use a fraction if amount of light decreased.

5.)What is the total exposure change?

6.)To compensate, you need to change the exposure from the light source by what factor?

7.) Calculate the distance where the light should be placed to get the same exposure