1.0 video Lesson 18 Ratios 960 540 iPlayerHD https://iplayerhd.com <iframe src="//iplayerhd.com/player/video/02092474-36bd-48b5-b70f-419230e324d0?cbartype=over" allowtransparency="true" frameborder="0" scrolling="no" allowfullscreen mozallowfullscreen webkitallowfullscreen oallowfullscreen msallowfullscreen width="960" height="540"></iframe>