A glass prism splits white light into different colours. This phenomenon is called dispersion of light by prism. Which one of the following statements is correct ?
Red light will deviate the most and it is because of the reflection of light.
Violet light will deviate the most and it is because of the refraction of light.
Red light will deviate the most and it is because of the refraction of light.
Violet light will deviate the most and it is because of the reflection of light.
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2021
– This occurs because the refractive index of the prism material is different for different wavelengths (colours) of light; this phenomenon is called refraction.
– The deviation angle for a given colour depends on the refractive index for that colour.
– Violet light has the shortest wavelength and the highest refractive index in glass, causing it to bend the most.
– Red light has the longest wavelength and the lowest refractive index in glass, causing it to bend the least.
– Dispersion is a phenomenon of refraction, not reflection. Reflection is the bouncing back of light from a surface.