Photography assignment, , #3 9. unit of light intensity used in the united states a. technical continuity b. color temperature c. lux d. foot candle 10. unit of light intensity used in most countries. a. technical continuity b. color temperature c. lux d. foot candle 11. the purpose of the is to reduce (but not eliminate) the shadows created by the horizontal and vertical angles of the key light. a. fill light b. flood light c. back light d. key light 12. the function of the light is to separate the subject from the background by creating a subtle rim of light around the subject. a. fill light b. flood light c. back light d. key light 13. as the name implies, the is the main light. the highlights the form, dimension and surface detail of subject matter. a. fill light b. flood light c. back light d. key light