wp thumbnail

<div class="thumbnail-img">
<?php
    $lastBlog = new WP_Query('post_type=post&posts_per_page=2');
    if ($lastBlog->have_posts()) {
        while($lastBlog->have_posts()) {
             $lastBlog->the_post();
              if(has_post_thumbnail()){
                  the_post_thumbnail();
             }
         }
     }
  ?>
 </div>