How to find Polaris using 'The Plough'

To find Polaris (The Pole Star) you can use one of, if probably not, the most recognisable asterisms in the northern hemisphere, The Plough.

On a clear night look up and find The Plough (or The Big Dipper) and locate the two stars which form the blade of the plough, Merak and Dubhe.

Now, in your mind as you look at these stars, draw an imaginary line between Merak and Dubhe and extend the line north until you come to the relatively bright star, Polaris.