Question
Download Solution PDFThe change in focal length of an eye lens is caused by the action of the ______.
This question was previously asked in
SSC JE EE Previous Year Paper 5 (Held On: 24 Jan 2018 Evening)
Answer (Detailed Solution Below)
Option 3 : Ciliary muscle
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Electrical Machine for All AE/JE EE Exams Mock Test
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Detailed Solution
Download Solution PDFCONCEPT:
- Pupil is a hole through which light enters into our eye.
- Iris is a muscle in our eye that controls size of pupil. It dilate and contract because of which size of pupil vary.
- So we can say Iris controls the amount of light entering into our eye.
- Retina : Image is formed on retina.
- Ciliary muscles are smooth muscle fibers. When the ciliary muscles relax the lens become flat and when they contract the lens becomes thicker. This change in curvature of the eye lens changes the focal length of the eyes.
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EXPLANATION:
- When ciliary muscles relax, eye lens becomes thin and focal length increase and this enables to see distant object.
- When ciliary muscle contract, eye lens become thick, and so focal length decrease. it enables us to see nearby objects.
- So The correct answer is option 3 i.e. Ciliary muscle.
Last updated on May 29, 2025
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