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Which of the following colours of light is bent through a minimum angle when passing through a glass prism?
Green
Violet
Yellow
Blue
Yellow
When white light passes through a glass prism, it undergoes dispersion into its constituent colours. The light with the longest wavelength, which is red (though not an option here, yellow is the longest among the choices), bends the least, while the light with the shortest wavelength, violet, bends the most.
When white light passes through a glass prism, it undergoes dispersion into its constituent colours. The light with the longest wavelength, which is red (though not an option here, yellow is the longest among the choices), bends the least, while the light with the shortest wavelength, violet, bends the most.
Think of light as a group of runners on a track; the shorter wavelength (Violet) is like a smaller runner who is easily 'pushed' or turned by the obstacle (prism), while the longer wavelength (Yellow) is like a larger, more momentum-driven runner who stays closer to their original path.
VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red). Deviation increases towards Violet, and decreases towards Red.
╬┤=(nтИТ1)A тАФ the deviation angle ╬┤ for a thin prism, where n is refractive index and A is prism angle
v=f╬╗ тАФ the relationship between velocity, frequency, and wavelength
The refractive index (n) of a medium depends on the wavelength (╬╗) of light, described by Cauchy's equation. Since n(╬╗)тЙИA+╬╗2BтАЛ, shorter wavelengths have a higher refractive index and thus experience greater deviation (bending) according to Snell's Law. As VIBGYOR represents the spectrum from violet (shortest wavelength) to red (longest wavelength), deviation decreases as you move towards the red end of the spectrum.
Dispersion is the phenomenon of splitting white light into seven colours.
The angle of deviation is inversely proportional to the wavelength of light.
Violet light has the shortest wavelength and maximum deviation.
Red light has the longest wavelength and minimum deviation.
Formation of a rainbow
Spectroscopy in laboratories
Wavelengths: Violet (тЙИ380тИТ450 nm) < Blue (тЙИ450тИТ495 nm) < Green (тЙИ495тИТ570 nm) < Yellow (тЙИ570тИТ590 nm).
Option B (Violet) is the color that deviates the most.
Option A (Green) and Option D (Blue) have intermediate deviations.
C is correct тАФ Yellow light has the longest wavelength among the given choices, resulting in the minimum angle of deviation as it passes through the prism.
Always remember the VIBGYOR sequence; knowing that Red is at one end (minimum deviation) and Violet at the other (maximum deviation) solves almost all prism-related questions.
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