Dispersion of Light : CBSE Class 10 Science | Toppr Study

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Dispersion of Light : CBSE Class 10 Science | Toppr Study. In today's video, Dispersion of Light from (CBSE Class 10 Science) Let's watch this amazing topic for your effective Board Exam - Science Preparation with proper explanation by your favorite teacher. In this session, you will find Tips, Tricks, and Strategies in detail to score full marks in class 10 Science. So, Don't Miss It!!

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In this video of CBSE class 10 Science, we are going to discuss the dispersion of light, the dispersion of light, the composition of light, how white light is formed, why we see the rainbow after rainfall.

Topics covered :

0:18 - Formation of White Light
2:01 - Seven different colors VIBGYOR
2:53 - Prism
3:55 - Sequence of Color(Reflected Light)
5:00 - Spectrum of White Light
5:52 - Deviation - Min & Max
7:04 - Recombination
8:10 - Rainbow

Dispersion of Light
Newton proved that white light is made up of 7 colors namely VIBGYOR. He proved it by using a glass prism.
When a beam of white light is passed through a glass prism, it split's up into a band of colors called spectrum. This phenomenon is called the dispersion of white light.
The spectrum of white light has the colors violet, indigo, blue, green, yellow, orange and red (VIBGYOR). The sequence of seven colors obtained from the dispersion of white light is called the spectrum of white light.

So, why do we get these colors?
Different colors of light bend through different angles with respect to the incident ray, as they pass through a prism(on refraction). The red light bends the least while the violet light bends the most. Thus the rays of each color emerge along different paths and thus become distinct.

Recomposition of light
Issac Newton was the first to use a glass prism to obtain the spectrum of sunlight. He tried to split the colors of the spectrum of white light further by using another similar prism. However, he could not get any more colors. He then placed a second identical prism in an inverted position with respect to the first prism.
This allowed all the colors of the spectrum to pass through the second prism. He found a beam of white light emerging from the other side of the second prism. This observation gave Newton the idea that the sunlight is made up of seven colors. This phenomenon is known as the Recomposition of light.

Formation of Rainbow
Rainbows are generally formed after rains. It is a concentric colored circular arc in the sky when the sun rays fall on raindrops during or after a shower. The small droplets of rainwater which remain suspended in the air just after the rains act as a prism.

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