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

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)