Fal::getFilePath() 

\nn\t3::Fal()->getFilePath($falReference); 

Get the URL to a FileReference or a FalFile. Alias to \nn\t3::File()->getPublicUrl().

\nn\t3::Fal()->getFilePath( $fileReference ); // results in e.g. 'fileadmin/bilder/01.jpg'
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@param \TYPO3\CMS\Extbase\Domain\Model\FileReference|\TYPO3\CMS\Core\Resource\FileReference $falReference
@return string

Source Code 

public function getFilePath($falReference)
{
	return \nn\t3::File()->getPublicUrl( $falReference );
}
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