Focusing on Near and Far Objects

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Questions and Answers

When focusing on a distant object, what changes occur in the eye to ensure a clear image is formed on the retina?

The eye muscles tauten, making the lens thicker and more powerful.
The eye muscles relax, causing the lens to become thinner and less powerful. (correct)
The eye muscles remain in a neutral state, with no change to the lens.
The eye muscles contract, causing the lens to become more spherical and powerful.

Why is the image formed on the retina described as 'inverted'?

The brain processes the image in reverse, so the retina must receive an inverted image.
The lens inverts the light rays to correct for visual perception.
The light rays cross as they pass through the lens, resulting in an upside-down image. (correct)
The cornea reverses the light rays before they reach the lens.

What is the primary difference in how light rays reach the eye when viewing a near object versus a far object?

Light rays from near objects are parallel, while those from far objects are divergent.
Light rays from near objects travel faster, requiring more adjustment by the lens.
Light rays from near objects are more intense, requiring less focusing.
Light rays from near objects are divergent, while those from far objects are nearly parallel. (correct)

How does the eye adjust to focus on a near object compared to focusing on a far object?

<p>For near objects, the lens becomes thicker; for far objects, it thins out. (C)</p> Signup and view all the answers

In the context of image formation on the retina, what is the relationship between the power of the eye lens and the distance of the object being viewed?

<p>The lens power increases for near objects and decreases for distant objects. (C)</p> Signup and view all the answers

Flashcards

Retinal Image Formation

Light rays converge to form a reversed and inverted picture on the retina.

Focusing on Near Objects

When looking at nearby objects, divergent light rays require the eye lens to thicken and increase in power.

Eye Muscles for Near Focus

The eye muscles contract, causing muscle fibers to shorten, which in turn makes the eye lens thicker and increases its power.

Focusing on Far Objects

When viewing far away objects, incoming light rays are nearly parallel, necessitating a thinner, less powerful eye lens.

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Eye Muscles for Far Focus

The eye muscles relax and the muscle fibers lengthen, causing the eye lens to become thin and have less power.

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Study Notes

The eye forms images on the retina.

Near Objects

Rays from near objects are divergent.
To focus on near objects, eye muscles contract, shortening muscle fibers.
This contraction makes the eye lens thicker and more powerful.
The image formed is inverted.

Far Objects

Rays from distant objects are nearly parallel.
To focus on distant objects, eye muscles relax, lengthening muscle fibers.
This relaxation causes the eye lens to become thin and less powerful.
The image formed is inverted.

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Description

The eye focuses images on the retina by adjusting the shape of its lens. For near objects, eye muscles contract to thicken the lens, while for far objects, the muscles relax to thin the lens. This adjustment ensures clear vision at varying distances.