Human eye and colourful world is all theoretical chapter and therefore students think it will be easier to study. But theory is more difficult to arrange than the mathematical question. Sometimes students end up by writing unnecessary statements but the main point missing. So always remember the theory question should always be written in points. It will help you to understand now what to write next and also examiner will be happy.
This chapter can be separated into to larger parts
1. Human eye
2. Colourful world
Human eye: Human eye part can further be devided into
1. The structure and the function of human eye.
2. Eye defects.
Colourful world: It has following mejor parts
1. Refraction of light through glass prism
2. Dispersion of light
3. Atmospheric refraction
4. Scatteeing
Other than this to mejor parts, there are some numericals based on myopia and hypermetropia. But to solve them we dont need new formulae. Those can be solved by the same formulae we used for lenses.
Go part by part and study the chapter. Try not to read line by line from the book. Click on the world, and you may find the more information about the topic.
All the best...!
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CBSE