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When white light falls on a glass prism, it splits into seven colours. The phenomena is known as:
diffraction
dispersion
deviation
refraction
dispersion
When white light passes through a glass prism, it splits into its seven constituent colors (VIBGYOR). This phenomenon of splitting white light into its component colors due to differential refraction is known as dispersion.
When white light passes through a glass prism, it splits into its seven constituent colors (VIBGYOR). This phenomenon of splitting white light into its component colors due to differential refraction is known as dispersion.
The formation of a rainbow in the sky after rainfall is a natural example of dispersion, where tiny water droplets act like microscopic prisms.
VIBGYOR тАФ Violet, Indigo, Blue, Green, Yellow, Orange, Red (in increasing order of wavelength and decreasing order of deviation).
╬╝=sinrsiniтАЛ тАФ Snell's Law of Refraction
╬┤=(nтИТ1)A тАФ Angle of deviation for a thin prism
White light is a mixture of seven different wavelengths. When it enters a glass prism, each wavelength (color) bends (refracted) by a different angle because the refractive index of glass is slightly different for each wavelength (Cauchy's dispersion formula). Violet light, having the shortest wavelength, bends the most, while red light, having the longest wavelength, bends the least.
Sir Isaac Newton first used a glass prism to obtain the spectrum of sunlight in 1665.
Red light has the maximum wavelength and minimum deviation.
Violet light has the minimum wavelength and maximum deviation.
Dispersion occurs because the refractive index of a medium depends on the wavelength of light.
Helps in studying the emission and absorption spectra of light sources
Crucial for understanding atmospheric phenomena like rainbows and scattering
Spectrometers for chemical analysis
Formation of rainbow in the atmosphere
Analyzing starlight in astronomy
Option A (diffraction): Bending of light around corners of obstacles.
Option B (dispersion): Splitting of white light into constituent colors (Correct).
Option C (deviation): The angle by which a ray of light is deflected from its path.
Option D (refraction): The bending of light when it passes from one transparent medium to another.
B is correct тАФ Dispersion is the phenomenon of splitting white light into its seven constituent colors when passing through a glass prism.
Remember that dispersion happens because different colors travel at different speeds inside a denser medium like glass, causing varying degrees of refraction.
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