Alight bulb is used for seeing in the dark, and light is emitted by a light bulb. Given these facts, what is emitted light used for  among the following options:
- electricity
 - To see in the dark.
 - activation energy
 - heat energy
 - kinetic energy
 - an electron microscope
 - major threat to health
 - Electrical energy


 

  To see in the dark.       