When a white light beam is made to fall on a hollow prism filled with water, it breaks into seven constituent colours. Which of the following colours suffers the maximum angle of deviation?
[amp_mcq option1=”Red” option2=”Violet” option3=”Green” option4=”All suffer by equal amount of deviation” correct=”option2″]
This question was previously asked in
UPSC CAPF – 2021
When a beam of white light passes through a prism, it is dispersed into its seven constituent colours due to the difference in the refractive index of the prism material for different wavelengths of light. The extent to which a colour is deviated depends on the refractive index for that colour; a higher refractive index leads to a greater deviation.
The refractive index of a material is highest for shorter wavelengths (like violet light) and lowest for longer wavelengths (like red light). Consequently, violet light undergoes the maximum deviation, while red light undergoes the minimum deviation.