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 following color have a wavelength of 460 - 500 nm ? | |||
Right Option : D | |||
View Explanation |
The colour of scattered particles depends upon ______________. | |||
Right Option : C | |||
View Explanation |
___________ consists of all the colors of the visible spectrum. | |||
Right Option : B | |||
View Explanation |
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
It has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
A marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.