Insert image in pdf in php using mpdf

Here,below is my code for converting an image into pdf using mpdf. $html containsupload/tulips.jpg But,when the function executes the pdf file created and an image icon shows there with the locationupload/tulips.pdf. Kindly tell me why this is happening because no bug is coming.

   private function ConvertImageToPdf($inputPath,$outputPath)
            { 
                $mpdf=new mPDF();
                $html='<img src='.$inputPath.'/>';
                $mpdf->WriteHTML($html);
                $mpdf->Output($outputPath.".pdf",'F');
                $mpdf->debug = true;

            }
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