Question

How does the eye change in order to focus on near or distant objects?
A. the lens moves in or out
B. the retina moves in or out
C. the lens becomes thicker or thinner
D. the pupil becomes larger or smaller

Answer 1

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C. the lens becomes thicker or thinner

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Answer 2

C. The lens becomes thicker or thinner in order to focus on near or distant objects.

Explanation:

• Ciliary muscles controls the size of the lens. Lens in eye is used to refract the light from the object.
• After refraction, the image of the object falls on retina. The lens relaxes and expands to make the image fall correctly on retina. This is called accommodation.
• When the object is near, the fibre of the lens are taut, ciliary muscles are relaxed, lens has its maximum focal length and it is in least round shape.
• When the object is far, the fibre of the lens are loose, ciliary muscles are contracted and lens has its minimum focal length. So, more fraction occurs.