I would say the bulb is blown in it, Are it has a bad ground.
Some vehicles have a separate fuse for left and right headlights and high and low functions so check your fuses too. More vehicle info like year and make would help.
High beam light is out!
Generally speaking, high beams and low beams are two different elements in the headlight bulb, so if one is burned out the other can still work fine. you will need to replace the bulb.
Burnt out maybe...........
Yes they do work but it's a quarterly, bi-annual or annual maintenance item. In other words its not a one time deal.
If only one is out, its probably a bulb. If both are out its probably a fuse. For headlight bulb information see sources and related links below.
Some cars allow you to leave one or other headlight on when you are parked in the street at night (for safety) - have you checked if your car does this in the manual - if it does then you will be able to switch it off.
No, series circuits are not used in car headlights, because if one headlight were to go out the other would also, because the one light would make an incomplete circuit. Headlights are wired as parallel circuits because when one headlight goes out, the other is unaffected and stays as bright as it was before the other light went out.
Most likely it's the motor, you can open it manually.
Automobile headlights are typically wired in parallel. This means that each headlight is connected directly to the power source independently, allowing them to operate separately from each other. This setup ensures that one headlight can still work if the other one fails.
There could be a couple of reasons why the headlights won't work when the other lights do. One reason could be a blown bulb. Another reason could be a problem in the wiring.
and it is not burned out
No! The headlight adjustment is out of whack or you did a hit and run that you forgot about that bent some things holding the headlight.