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Indoor Rainbow Model: An Apparatus for Observing Spectrum in Classroom

The beautiful colors of the rainbow have always fascinated humans and especially children are inspired to various artworks such as drawing, canvas painting, poster, wall decals and so on. Since refraction and reflection of light cannot be seen taking place in raindrop during rainbow formation, children are unaware of all these details. Although throughout the year past, there are many literatures on theoretical and mathematical aspects of rainbow formation, however there are very few studies in education context to teach about this phenomenon to the children in particular by observing and measuring. Therefore, in this paper we are proposing a model that can be used for hands-on learning with high school students about the formation of spectrum in glass sphere. With the help of the model students can see the angle at which different color lights are deviated by the glass sphere and finally, students can also relate the concept learnt from this lesson to real life phenomenon about spectrum formation by rain drop.