Question

When ciliary muscles contract, what happens?

1) Tension is increased on the suspensory ligaments.
2) The choroid is pulled toward the lens.
3) The lens gets flatter.
4) The focal point moves closer to the lens.
5) All of these

Answer 1

When ciliary muscles contract, they cause the lens to become thicker and more powerful at bending light, which moves the focal point closer to the lens for clear vision of nearby objects.

Step-by-step explanation:

When ciliary muscles contract, the lens becomes thicker, which increases its power to bend light more effectively. This process is known as accommodation, and it is essential for the eye to focus on nearby objects. As the ciliary muscles contract, they release tension on the suspensory ligaments, allowing the lens to thicken and become more rounded, not flatter. Consequently, the focal point moves closer to the lens, ensuring that the light rays from the object being viewed are focused precisely on the retina for clear vision.

The correct answer to the question is therefore 4) The focal point moves closer to the lens, as this is the outcome of the lens becoming thicker and the ciliary muscles contracting.