Accommodation of an Eye
Accommodation of an Eye
Accommodation :
It is the process by which eye changes the focal length of the eye lens with the help of cilliary muscles such that a sharp image is always formed on the retina. Light rays enter the eye first through the cornea, which is the clear dome at the front of the eye. The light then progresses through the pupil, the circular opening in the center of the iris and then to the crystalline lens, which is located just behind the pupil. The light rays were first bend by the cornea, and then further by the crystalline lens.
How the Eye Adjusts for Objects at Different Distances:
For clear vision, sharp images of objects has to be formed on the retina. Since the distance of the retina from the eye-lens is fixed, so the distance of the image is fixed. However, we need to see objects that are at different distances from the eye.
To form clear and sharp images of both at the same distance from the lens, the focal length of the eye-lens has to change. The cilliary muscles are used change the focal length of the eye-lens. When we are looking at a distant object (usually farther than 6 m), the cilliary muscles are in their most relaxed state. Then the focal length of the eye-lens is such that rays coming from the distant object are focused on the retina, and we see the object clearly.The minimum distance, at which objects can be seen most distinctly without strain,is called the least distance of distinct vision and the farthest point upto which the eye can see object clearly is called as the far point of the eye. It is infinity for the normal eye
The change in focal length of an eye lens is caused by the action of the _________________. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) Light rays enter the eye first through the cornea, which is the clear dome at the front of the eye. (b) The minimum distance, at which objects can be seen most distinctly without strain,is called the least distance of distinct vision . (c) .This process of adjustment of the focal length of the eye-lens is called accommodation. | |||
| Right Option : D | |||
| View Explanation | |||
For a normal eye, in case of an adult, the least distance of distinct of distinct vision is______________. | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
My 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
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
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
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
10thIt 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
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
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
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
10thOne 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
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.
