I am trying to upload a news item that requires a image and a message

my form looks like

   <form action="/admin/nieuws/toevoegen" method="post" enctype="multipart/form-data">
		<div class="form-group">
			<input type="text" class="form-control" id="titel" name="titel" placeholder="Titel">
		</div>
	
	
		<div class="form-group">
			<label for="bericht">Het bericht</label>
			<textarea name="bericht" id="bericht" placeholder="Het nieuwsbericht">tester</textarea>
		</div>
		 
		<div class="form-group">
			<label for="exampleInputFile">Afbeelding </label>
		    {{ Form::file('file', array('multiple'=>true, 'id'=> 'file'));}}
			<p class="help-block">350px x 200px</p>
		</div>
		<button type="submit" class="btn btn-success">Toevoegen</button>
	{{ Form::close() }}

any my form handling looks like.

   public function postAddNieuws()
{
	$rules = array(
		'titel' => array('required', 'unique:nieuws,titel', 'min:7'),
		'bericht'    => array('required'),
		'file' => array('required','image')
	);
	$validation = Validator::make(Input::all(), $rules);
	if ($validation->fails())
	{
		return Redirect::to('admin/nieuws/toevoegen')
    	->withErrors($validation)
    	->withInput();
	}
	else 
	{
		return View::make('admin.nieuws.toevoegen');	
	}			
}

it dos not check the file and skips the image check what am i doing wrong?