Put the events of the light dependent reactions in the order in which they occur and describe how each step is dependent

Photosynthesis is a process in which light dependent reactions is undertaken and can be studied elaborately. Photosynthesis is a process from which light energy transfers electrons from water to carbon hydroxide which produces carbohydrates. Water, Light intensity and temperature have huge hand in influencing the rate of photosynthesis.  
1. Light energy is absorbed by electrons in the pigments and water molecules are split into Hydrogen atoms.
 2. High Energy electrons move down the electron transport chain to pump the Hydrogen ions. 
3. NADP+ molecules reacts with higher energy electrons along with H+ to form NADPH. 
4. The H+ ions pass through ATP synthase causing the base to rotate and form ATP (Adenosine Triphosphate)

The answer is telescope.