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The concept of dispersion of white light by a glass prism is one of the most fundamental concepts within the topic of Ray Optics. Such concepts, when taught and explained through audio-visual means, combined with real-life examples, can make them easier to grasp for students.
1. How does the dispersion of white light take place when it passes through a glass prism?
White light is made up of constituent colours of light that have their unique refractive indices. Their difference in wavelength causes them to have different angles of deviation, which is made up of colours with red light bending the least and violet light bends the most.
2. Why is light dispersed by a glass prism?
The light that falls upon the surface of the prism gets separated into lights of component colours, which is called as Dispersion Of White Light By A Glass Prism. The colours have different wavelengths that travel at velocities through the transparent prism. This causes light to disperse by a glass prism due to the difference in the medium of propagation.
3. What is meant by the dispersion of white light? Draw a neat diagram to show the dispersion of white light by a glass prism. What is the cause of dispersion?
White light or sunlight gets dispersed into 7 component colours, VIBGYOR, with violet bending the most, and red bending the least. The separation of white light into component colours is known as the dispersion of light.
The cause for dispersion is that violet has a shorter wavelength, which slows it down more, compared to red light with a longer wavelength that is the least dispersed.
4. What is the dispersion of white light? State its cause?
Dispersion of white light is an optical phenomenon, wherein sunlight/white light that is incident upon glass prism is split into its constituent colours, namely VIBGYOR. A dispersive glass prism causes this phenomenon due to its refractive index varying with the wavelengths of the individual colours that combine to form the sunlight. Refractive Index (I) variation causes a change in the resultant angle of deviation, thus causing the sunlight to be split spatially, giving out the spectrum of colours.
5. What is the reason for dispersion?
Light in itself has specific characteristics to it. As it travels through the medium, it possesses a certain wavelength, and it tends to travel in a straight line. Following the Snell’s Law that defines the formula for angles and their indexes, we can infer that the dispersion is caused due to the nature of the dispersive optical device (Prism) that has a different refractive index than air, the previous medium of propagation. This difference in the refractive index causes the light having constituent colours of different wavelengths, to be bent at different angles, thus splitting them into those colours spatially.
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