Colour and the wavelength of light
Colour and the Wavelength of Light
The colour of light is related to its wavelength. Wavelength can be defined as the distance between two crests or troughs of a wave. It is inversely proportional to the frequency of the wave. The table below gives the relation between the wavelength and colour of light. In the table, the wavelengths are given in nanometres (1 nanometre =
). Note that among visible lights, red has the longest wavelength, while violet has the shortest.
In 1666, the English scientist Issac Newton (1642-1727) passed a narrow beam of light through a glass prism. As the light exiting the prism, Newton could see the colours of the rainbow. Newton realised that white light consists of all the colours of the visible spectrum. He listed the colours making up this spectrum as red, orange, yellow, green, blue, indigo and violet. When all the colours shine at once, they produce white light.
Each colour of light is a wave with a different wavelength and frequency. The wavelengths of visible light are extremely small, ranging from violet light with wavelengths around 400 nm(nanometers) to red light with wavelengths around 700nm. To get an idea of how small this is, consider that 1 nm(nanometre) = 0.000 000 009 m = . This means that the wavelengths of visible light are less than one-thousandth of a millimetre long, or about one-hundredth the width of a human hair.
|
Colour |
Wavelength in nm |
Colour |
Wavelength in nm |
|
Violet |
400-440 |
Yellow |
570-590 |
|
Indigo |
440-460 |
Orange |
590-620 |
|
Blue |
460-500 |
Red |
620-700 |
|
Green |
500-570 |
|
|
Which of the colours of visible light has minimum frequency ? | |||
| Right Option : B | |||
| View Explanation | |||
When all the colors shine at once, they produce _____________ light. | |||
| Right Option : C | |||
| View Explanation | |||
The distance between two crests or trough of a wave is inversely proportional to the frequency of the wave is called as ___________________. | |||
| Right Option : B | |||
| View Explanation | |||
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