Q. 174.4( 10 Votes )
When and where do we see a rainbow? How is a rainbow formed? Draw a labelled diagram to illustrate the formation of a rainbow.
Rainbow is defined as the natural phenomenon in which due to dispersion of white light, an arch of seven colors is formed.
We see rainbow in the sky only after rainfall due to dispersion of sunlight by the tiny water droplets of rain present in the atmosphere. The water droplets act like small prisms. The rain drops are refracted, dispersed and reflected internally and then refracted again. Due to these phenomena’s, we see a rainbow in the sky after rainfall.
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A beam of white light falling on a glass prism gets split up into seven colours marked 1 to 7 as shown in the diagram.
A student makes the following statements about the spectrum observed on the screen.
i. The colours at positions marked 3 and 5 are similar to the colour of the sky and the core of a hard boiled egg respectively.
Is the above statement made by the student correct or incorrect? Justify.
ii. Which two positions correspond closely to the colour of
(a) a solution of potassium permanganate?
(b) ‘danger’ or stop signal lights?
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(b) shortest wavelength ?Lakhmir Singh & Manjit Kaur - Physics