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Physics-CBSE-class-10-->View question

## 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 -CBSE physics class 10

hown in the diagram. A student makes the following statements about the spectrum observed on the screen.
a) 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
. b) Which two positions correspond closely to the colour of
(i) a solution of potassium permanganate?
(ii) βdangerβ or stop signal lights?

Asked On2017-07-13 00:20:41 by:milan-ransingh

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If red is 1 and violet is 7 then, we will have
red= number 1
orange= 2
yellow= 3
green = 4
blue= 5
indigo= 6
violet= 7
now,
colour of the sky would be represented by number 5(blue) while colour of yolk will be represented by number 3(yellow). so, the statement is false.
KMNO4 has a violet colour which would be represented by the number 7 and danger or stop signal, whicj is red would be represented by number 1.

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