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Dispersion of White Light by Glass Prism

A beam of whi...

Question

A beam of white light falling on a glass prism gets split up into seven colors marked 1 to 7 as shown in the diagram.

Which two positions correspond closely to the color of:
(a) a solution of potassium permanganate?
(b) 'danger' or stop signal lights?

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Solution

White light gets split up into seven colors, which are as follows:

(7) Violet (6) Indigo (5) Blue (4) Green (3) Yellow (2) Orange (1) Red

(a) Potassium permanganate is an odorless dark purple colored solid. Hence, color position 7 corresponds to potassium permanganate closely.

(b) The red color is a mark of danger or symbol for danger in general. Hence, color position 1 suits closely for danger signal.

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