What was Joseph Nephore Niepcetrying to perfect when he stumbled onto photography

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?

Is the name that historians use for the time period beginning around 476? a. baroque b. rococo c. the renaissance d. the middle ages

Which career worker installs, maintains, and repairs equipment used for communication?