1. Determine the central theme: take "light dispersion" as the central theme and determine its position. Determine sub-themes: around the central theme, list several sub-themes, such as "dispersion principle", "dispersion phenomenon" and "application scenario".

2. Subdivide sub-topics: For each sub-topic, further subdivide and expand. For example, "dispersion principle" can be subdivided into "fluctuation of light" and "particle nature of light" Dispersion phenomenon can be subdivided into dispersion in astronomy and dispersion in laboratory.

3. Use graphics and colors: In order to make mind maps more vivid and interesting, you can use different graphics and colors to mark different themes and sub-themes. For example, the blue label "dispersion principle" and the green label "dispersion phenomenon" are used. Add connecting lines: In order to make the mind map clearer and easier to understand, you can add connecting lines to show the relationship between different topics.

The Significance of Writing Mind Map

1. Mind mapping can help people clear their minds more clearly. In the process of writing or thinking, you will often encounter confused ideas and have no way to start. At this time, by drawing the mind map, we can clearly show the relationship and level between each theme and sub-theme, help people better sort out their thoughts and improve the order of thinking.

2. Mind mapping can help people solve problems more effectively. In the face of complex problems or projects, it is often necessary to analyze and think from multiple angles. At this time, by drawing a mind map, all aspects, angles and levels of the problem can be presented, helping people to understand the problem more comprehensively and solve it more effectively.

3. Mind mapping can help people learn and remember knowledge more efficiently. By drawing the mind map, we can clearly show the knowledge points, key points, difficulties and their relationships, help people better grasp the knowledge system and key points, and improve learning efficiency and academic performance. At the same time, mind mapping can also help people better recall and consolidate what they have learned.