Q. 194.4( 13 Votes )
How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.
We know that, when light falls on a prism, then the light gets split into its seven colors in form of ROYGBIV. When two the same prism is kept with an identical prism, but in inverted form, then the light emerging out from first prism will merge together as result in white light. The ray diagram showing it is as follows:
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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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