Which of the following best describes the power of accommodation of the human eye?
The ability of the eye lens to change its focal length to focus on objects at different distances
The distance between the eye lens and the retina is fixed, so a sharp image of both near and distant objects can only be formed if the lens itself changes its converging power.
The ciliary muscles do this: when they contract the lens becomes thicker and its focal length shortens for near objects, and when they relax the lens thins and its focal length lengthens for distant objects. This adjustment of focal length is called the power of accommodation.
Changing pupil size only controls how much light enters, and eyelid or eyeball movement plays no part in focusing an image on the retina.
Hence, the answer is The ability of the eye lens to change its focal length to focus on objects at different distances.
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Important Questions from Optics
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Twinkling of stars is due to:
In which a convex mirror is used?
A. Rear View mirrors in vehicles
B. Glass windows
C. Makeup Mirror
D. Kaleidoscope
What is the reason for formation of Mirage in desert?
An object is placed 10 cm in front of a lens. The image formed is real, inverted and of same size as the object. What is the focal length and nature of the lens?
