Dispersion Discovery by Isaac Newton
The phenomenon known as the dispersion of light is the effect where white light splits into its distinct constituent colours when passing through a transparent medium, such as a prism.
This happens because each colour (wavelength) of light is refracted at a slightly different angle. Violet light, having a shorter wavelength, bends the most, while red light, with its longer wavelength, bends the least.
Sir Isaac Newton conducted pivotal experiments in 1666 that demonstrated this principle. He showed that white light could be separated into a spectrum of colours using a prism, and later proved that these colours could be recombined to form white light again.
Newton's work established that the visible spectrum consists of seven colours: red, orange, yellow, green, blue, indigo, and violet.
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Important Questions from Physics
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
