(a) What is dispersion of white light? State its cause.
(b) "Rainbow is an example of dispersion of sunlight." Justify this statement by explaining, with the help of a labelled diagram, the formation of a rainbow in the sky. List two essential conditions for observing a rainbow.
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a). 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.
b). Conditions for observing a rainbow :
(a) after the rainfall/ at a water fountain.
(b) sun is at the back of the observer.
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.
b). Conditions for observing a rainbow :
(a) after the rainfall/ at a water fountain.
(b) sun is at the back of the observer.
gururandhawa62:
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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
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