Lens And Its Types
Lens And Its Types
A lens is a piece of transparent material with two refracting surfaces such that at least one is curved and the material of lens is different from that of the surroundings.
Convex lens:
A thin spherical lens which is thicker at the middle than the edges behaves as a convergent or convex lens i.e. it converges parallel rays. Depending on the type of two surfaces they can be further classified as:
1. Double Convex Lens: When both the refracting surfaces are convex surfaces. It is called double convex lens.
2. Plano - Convex Lens: When one of the refracting surface is plane and the other refracting surfaces is convex surfaces. It is called plano - convex lens.
3. Concavo Convex Lens: When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called concavo convex lens.
Concave lens:
If the central portion of a lens is thinner than marginal, it diverges parallel rays and behaves as a divergent or a concave lens.
1. Double Concave Lens: When both the refracting surfaces are concave surfaces. It is called double concave lens.
2. Plano - Concave Lens: When one of the refracting surface is plane and the other refracting surfaces is concave surfaces. It is called plano - concave lens.
3. Convexo Concave Lens: When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called convexo concave lens.
When one of the refracting surface of a lens is a concave surface and the other refracting surfaces is convex surfaces. It is called _____________________ . | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called Plano convex lens . (b) If the central portion of a lens is thinner than marginal, it diverges parallel rays and behaves as a divergent or a concave lens. (c) When both the refracting surfaces are concave surfaces. It is called double concave lens. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) When both the refracting surfaces of a lens are convex surfaces. It is called double convex lens. (b) Convex lens when one of the refracting surface is plane and the other refracting surfaces is convex surfaces. It is called plano - convex lens. | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
Third 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.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
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 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
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
Barkha Arora
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
7thIt 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
8thMy 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
8thMy experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
Hridey Preet
9thAbhyas 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
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
8thAbout 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
8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
10thWe 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
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
8thAbhyas 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
10thIt 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
10thBeing 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
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
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.
