Question

A white visible rays splits into corresponding colours when it passes through a prism.Give reason.​

Answer 1

Answer:

The colours are in a sequence VIBGYOR which means the lowest focal length of the colour sequence is violet and the highest is the Red due to the splitting of light it happens and the white light splits into seven consequent colours.

Explanation:

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Answer 2

Answer :

This phenomenon is known as the dispersion of white light.

Explanation :

First observed by Isaac Newton in the 1660s, the dispersion of white light is the direct result of the various components of white light, namely VIBGYOR    ( Violet, Indigo, Blue, Green, Yellow, Orange and Red light ), having different frequencies.

But how do different frequencies cause the dispersion of white light in a prism ? The frequencies of the various components of white light dictate how much they will bend in a prism, i.e, the first angle of deviation. Given that violet bends the most upon refraction, in a prism, it follows that violet light has the greatest frequency among the components of white light. Thus, red light has the least frequency among the components of white light as it has the smallest angle of deviation.

Note that the refraction of light on the first surface of the prism leads to an angle of bending known as the first angle of deviation. However, the final angle of deviation also takes into account the refraction of light that takes place at the second surface of the prism, as light passes once again into an optically rarer medium, such as air.