What is dispersion? State the cause of dispersion when white light enters a glass prism. Name
the colours which bend least and most respectively when a white light falls on a glass prism.
Explain with diagram
Answers
Answer:
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English and Hindi both languages
Explanation:
process by which people or things are spread over a wide area
आबादी या चीज़ों के दूर-दूर तक फैलने या विकीर्ण होने की प्रक्रिया, बिखराव, प्रकीर्णन, विकीर्णन, परिक्षेपण
Answer:
Explanation:
Refraction is the bending in the path of the light when it travels from one medium to the another. The degree at which refraction will occur depends on the wavelength of the light. Each light wave has a different wavelength and will therefore deviate differently. White light is composed of light of different wavelengths (colors) i.e. violet, indigo, blue, green, yellow and red. Red has the highest wavelength and violet the lowest.
Wavelength is inversely proportional to the deviation in the path of the light. Red light suffers the least amount of deviation and violet the most. When a white light is made to pass through a prism, formation of a spectrum of seven colors occurs showing white light is a combination of seven separate colors.
Prism only acts as a medium for the dispersion of light made of the seven colors. Refraction occurs when the light falls on the prism. The wavelength and frequency of these deviated colors is different, they deviate differently at different angles due to the velocity difference of the prism. The color red therefore deviates the least since it has maximum wavelength and color violet deviates the most since it has the least wavelength.
Refraction and Dispersion of Light
Refraction of Light through a Glass Prism
A glass prism has 3 rectangular lateral surfaces and 2 triangular bases, all inclined at an angle. This angle is called the ‘Angle of the prism’. Let’s take a triangular prism with a ray of light entering it.
Snell’s law mentions that,when traveling from a rarer medium to a denser medium light bends towards the normal, and bends away from the normal when traveling from denser medium to rarer medium. Here glass is denser than air, and therefore, when the light ray falls on the surface of the prism, the ray of light bends towards the normal. Hence according to the figure, when ray JP falls on the surface of the prism ,it bends towards the normal GP.
The emergent ray ON while moving from glass to air, it bends away from the normal. The angle of deviation, ∠XFN gives us the degree at which the emergent ray has deviated from the incident ray. The anagle of deviation is minimum when the angle of incidence is equal to angle of emergence. In the diagram given, ∠JPG = ∠YPN and ∠XFN is the angle of deviation, which is minimum. In this case the refracted ray PO is parallel to side EF.
This is how when passing through a prism, dispersion of light (white light) happens wherein it splits into it’s seven constituent colours. Different colors of different wavelength experience different degree of deviation and hence when put through refraction,white light splits into its constituent colors.
DIAGRAMS ARE GIVEN DOWN WARDS
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