Total Internal Reflection
Total Internal Reflection
When a ray of light travels from denser(higher refractive index) to the rarer (low refractive index) medium, it bends away from the normal . This means that angle of refraction is greater than angle of incidence
. With increase in the angle of incidence, the angle of refraction also increases.The figure below shows the incident ray in red colour, the refracted ray with blue colour and the green colour ray shows the part of ray which is reflected.
At a particular value of called as critical angle the angle of refraction becomes
.At this angle refracted ray then comes out parallel to the surface seprating the two media The figure below shows the incident ray in red colour, the refracted ray with blue colour and the green colour ray shows the part of ray which is reflected. We see that the blue ray grazes the surface seprating the two media.
The relation between the critical angle and the refractive index is
As we increase the angle above the critical angle it results in reflecting back of the ray into the same medium. This reflection obeys the law of reflection therefore angle of reflection of ray is equal to the angle of incidence
above the critical angle. The figure below shows the incident ray in red colour, As the angle of incidence is more than the critical angle there is no refracted ray hence there is no blue coloured ray and the green colour ray shows the reflected ray, which follows the laws of reflection..
Thus the total internal reflection of light takes place when a ray of light travels in a denser medium and is incident on the boundary with rarer medium at an angle greater that the critical angle. It is known as total reflection because when a ray falls obliquely on the interface of the two transparent medium, a part of it is reflected and a part of it is refracted. When the angle of incidence is greater than critical angle, the whole of the light ray is reflected. Hence it is called total internal reflection.
Which of the following are correct ? (a) When a ray of light travels from rarer to the denser medium, it bends away from the normal .With increase in the angle of incidence, the angle of refraction also increases. (b) When the angle of incidence is greater than critical angle, the whole of the light ray is reflected. Hence it is called total internal reflection . (c) The critical angle is different for different pairs of media. | |||
| Right Option : B | |||
| View Explanation | |||
For which of the following cases will the total internal reflection of light be possible? | |||
| Right Option : C | |||
| View Explanation | |||
The angle at which the light ray travelling from a denser to a rarer medium gets totally reflected back into the same medium is | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
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.
Manish Kumar
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
10thAbhyas 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
8thThe 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 is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
Yogansh Nyasi
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
8thAbhyas 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.
Om Umang
10thMy 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
7thMy 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
7thMy 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
8thUsually 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 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
8thOne 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
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.
Shreya Shrivastava
8thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thMy 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
8thI 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
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
7thIt 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
