Q. 64.7( 7 Votes )
A glass has a larger refractive index for which colour, violet of green?
Violet has a larger refractive index than green since it has a lower wave length. On refraction, wavelength and velocity change, whereas frequency does not. The colour of light or the wave having a higher wavelength will get refracted less.
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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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