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Question

The angle of minimum deviation of a ray of light of glass prism is greatest for the light of colour

A
Violet
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B
Orange
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C
Yellow
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D
Red
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Solution

The correct option is B Violet
The wavelength is directly related to angle of minimum deviation , smaller the wavelength larger the minimum deviation and vice versa.
λ1δm
So for greatest angle of minimum deviation wavelength will be minimum.
therefore Violet colour will be most deviated because it has minimum wavelength.

Option A is correct.


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