College introduction: The Open University (in English: The Open University) is a distance education university in the UK, which was established in 1969. The Central Office is located in Walton Hall, Buckinghamshire, Milton Keynes in the southeast of the UK, and has 13 offices in other places in the UK.

Course introduction: Rainbow is a puzzle that has been studied by mathematical and scientific circles for centuries. Human beings have used more than 2000 years of practice to explore the mystery of the rainbow. The following four courseware use 3D images to accurately reveal how light reflects from the surface of raindrops to form a rainbow we see. The course video is very interesting, beautiful and vivid, and easy to understand. Understanding the formation of the rainbow can also be seen as a rainbow adventure movie.