How well do you know your neighbourhood? What can you see if you explore?
In this activity, students go on an adventure in the schoolyard or around the neighbourhood to do a colourful visual collection.
A natural rainbow is a weather effect caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. In a primary rainbow, the arc is visible to the human eye as red on the outer part and violet on the inner side.
The range of wavelengths of light that the human eye can see is called "the visible spectrum". This includes the colours of the rainbow. ROYGBIV- Red, Orange, Yellow, Green Blue, Indigo, Violet. Indigo and violet are often described as "Purple".
| Colour | Wavelength Range (nm) |
| Red | 620-750 |
| Orange | 590-620 |
| Yellow | 570-590 |
| Green | 495-570 |
| Blue | 450-495 |
| Violet | 380-450 |
Each colour can be explained as a ray of light that is transmitted at a particular level of energy (with a particular wavelength). The shorter wavelength corresponds with greater energy.
NOTE: The range of wavelength for indigo is around 425–450 nm. It's hard for the human eye to distinguish and is usually considered a subset of violet, often combined as "purple".