laravel export pdf

Route:
Route::get('/siswa/export_pdf', 'SiswaController@pdf_siswa');

controller:
use PDF;

class SiswaController extends Controller
{
    public function pdf_siswa()
    {
        //echo "storage:".storage_path();
        //echo "storage:".public_path();
        //die;
        $show=[];
        $pdf = PDF::loadView('siswa.pdf', compact('show'));

        return $pdf->download('contoh.pdf');
    }
}

view

  <img src="{{public_path().'/contoh.jpg'}}" />