Dispersion of light by a prism
Dispersion of Light by a Prism
Dispersion Of Light By A Prism: As with any transparent material, lights of different colours travel at different speeds in the material of a prism. Hence, the refractive index of the material of a prism is different for different colours of light. So, when white light enters a prism, its different components (lights of different colours) bend by different amounts. This causes the components to separate out, or split. While emerging from the prism, they undergo a second refraction and bend further, increasing the separation between the colours. In this way, white light gets split into its component colours on passing through a prism.
Note that the component colours of white light bend by different amounts for all refractions. So, why does not light get split while passing through a rectangular slab? Light bends by equal angles but in opposite directions at the parallel faces of a rectangular slab. So, the components of light that split at the first refraction bend back and recombine to give white light after the second refraction.
In the band of colours obtained we can distinguish seven main, or prominent, colours. These are violet, indigo, blue, green, yellow, orange and red, in sequence. This sequence of colours can be remembered as VIBGYOR, which is formed by the first letters of the names of the colours. Whenever white light is split, its coloured components appear in this sequence. You see these colours in a rainbow too. When white light is dispersed, violet light deviates the most and red light deviates the least. This means, the refractive index of the prism material is the largest for violet and the least for red. The collection of coloured components produced by splitting light is called spectrum.
In the activity described above, white light is dispersed into its coloured components. We can recombine these components to produce white light. For this, take two similar prisms and keep the second one inverted with respect to the first. Let a narrow beam of white light fall on the combination of the prisms, and let the emergent light can be recombined by passing them through a fall on a wall. You will get a white patch prism, kept inverted with respect to the first on the wall.
The first prism splits white light into its coloured components. When these separated components pass through the second prism, they recombine to form white light. The second prism was kept inverted with respect to the first to recombine the components of white light.
The angle of minimum deviation of a ray of light for glass prism is greatest for the light of colour | |||
| Right Option : A | |||
| View Explanation | |||
What is the main reason white light is separated into different colors when passing through a prism?
| |||
| Right Option : B | |||
| View Explanation | |||
When white light passes through a prism, which color of light is deviated the most and why? | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [20]
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
Yatharthi Sharma
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thAbhyas is good institution and a innovative institute also. It is a good platform of beginners.Due to Abhyas,he has got knoweledge about reasoning and confidence.My son has improved his vocabulary because of Abhyas.Teacher have very friendly atmosphere also.
Manish Kumar
10thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
Aman Kumar Shrivastava
10thAbhyas academy is great place to learn. I have learnt a lot here they have finished my fear of not answering.It has created a habit of self studying in me.The teachers here are very supportive and helpful. Earlier my maths and science was good but now it has been much better than before.
Barkha Arora
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thMy experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
Upmanyu Sharma
7thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
7thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thBeing 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.
Prisha Gupta
8thIt 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.
Eshan Arora
8thAbhyas 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.
Manish Kumar
10thA 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.
Archit Segal
7thMy 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.
Hiya Gupta
8thIt 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
Barkha Arora
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thIt 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.
Cheshta
10thAbout 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.
