when another prism is again introduced the reaction is vice versa
The splitting up of white light into its constituent colours on passing through a refracting medium like a glass prism is called dispersion of light.
The dispersion of white light occurs because different colours of light bend through different angles with respect to the incident ray, as they pass through a prism. The red light bends the least while the violet the most as shown below.
The basic cause of the dispersion of light is the change in the spread of light as it goes from an transparent medium to another.
Dispersion of light is the splitting of light into its 7 constituent colours.
Violet bends the most.
Red bends the least.
(a) The splitting up of white light into its constituent colours is called dispersion. The colour sequence is given by the acronym V I B G Y O R – Violet, Indigo, Blue, Green, Yellow, Orange and Red. This colour pattern is called a spectrum.
Dispersion takes place because the speed of light of different colours through a glass prism is different and so, refractive index, therefore, each colour bends (refracts) through different angles with respect to incident ray as they pass through a prism. The red colour has maximum speed in glass prism. So, it is least deviated while the violet colour has minimum speed so its deviation is maximum. Thus, the ray of each colour emerges along different paths and becomes distinct.
(b) For dispersion, the two refracting surfaces must be inclined to each other as in case of prism. In rectangular glass slab, the refracting surfaces are parallel to each other. So, dispersion cannot occur. This is due to fact that the rectangular glass slab can be considered as equivalent of two identical prisms in inverted position placed in an inverted position with respect to each other. The deviation and dispersion produced by the second inverted prism is equal and opposite to that produced by the first prism.
Therefore, there will neither be dispersion, nor deviation, Le. second inverted prism recombines the , colour to give a white light parallel to the incident ray again and will undergo only lateral displacement. Hence, rectangular glass slab cannot produce any spectrum.
The spilting away of white light by any refractive medium such as prism is called dispersion of light.
Explanations.. proper explanation of what is dispersion and how the diagram and what is the least and the most bending colour....
Falling 0f light in seven bands of colour is known As dispersion of light
Tyndal effect is the cause of it..
Conditions to observe rainbow
Sun should be at our back.
There should be a rain before sun
For answer see the 3 attachments ...
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