Concepts Of Physics MCQ Edition [Volume 1]PhysicsOptical Instruments
When the eye observes objects located at various distances, which of the following remains constant?
Options
- AThe radii of curvature of the eye-lens.
- BThe focal length of the eye-lens.
- CThe distance of the object from the eye-lens.
- DThe distance of the image from the eye-lens.
Correct answer
D. The distance of the image from the eye-lens.
Step-by-step solution
When the eye observes objects at various distances, the object distance u changes. To form a sharp image on the retina, the eye-lens adjusts its focal length f by changing its radii of curvature with the help of ciliary muscles. This process is known as accommodation. Since the position of the retina relative to the eye-lens is fixed, the distance of the image from the eye-lens always remains constant.