Fact 1: Alight bulb is used for seeing in the dark.

Fact 2: Incandescent lights heat a metal filament that radiates light inside a glass bulb.

Given the two facts above, answer the question "What is used for used for seeing in the dark?" with the following options: 
- It gets more light
 - Magnifying glass
 - Heating a metal filament.
 - our nearest star
 - Eyeglasses
 - Electrical energy
 - Electric devices
 - Binoculars


 

   Heating a metal filament.      