Question

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

• A. Violet
• B. Orange
• C. Yellow
• D. Red

Answer 1

Answer: (A)

Violet

The wavelength is directly related to angle of minimum deviation , smaller the wavelength larger the minimum deviation and vice versa.

$\lambda \propto \frac{1}{{\delta }_m}$

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.