When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
RLSebring is right. The headlight is held down with 3 or 4 10mm nuts.
If you dropped it in the housing I'd try the following before attempting to remove the headlight.
Remove the tire and set the car on a jack stand. Use a straw type magnet found at tool supplies or maybe even autoparts or hardware stores. There are skinny flexible magnets that can fit inside. I'd use one of those to try and get it out.