Question at position 5 In the eye, the lens functions tofocus light on the retina at the back of the eye.protect the surface of the eye.increase vision in low-light conditions.move the eye side to side.Clear my selection

Question

Question at position 5 In the eye, the lens functions tofocus light on the retina at the back of the eye.protect the surface of the eye.increase vision in low-light conditions.move the eye side to side.Clear my selection

BlackTom AI · Accepted Answer

The lens is a transparent, flexible, biconvex structure whose primary function is to focus light onto the retina at the back of the eye.

1. Relevant knowledge points and concepts
- Anatomy: cornea, aqueous humor, lens, vitreous humor, retina, ciliary muscles. The cornea and lens are the eye’s refractive elements; the retina contains photoreceptors that detect focused light.
- Optics: refraction bends light rays; a convex lens converges light to form an image. Accommodation is the process by which the lens changes shape to focus objects at different distances.
- Physiology: ciliary muscles adjust lens curvature. A properly focused image falls on the retina for clear vision.

2. Step-by-step reasoning
- Incoming light first refracts at the cornea (provides most refractive power), then passes through the aqueous humor and reaches the lens.
- The lens fine-tunes focus by changing curvature: for near objects, ciliary muscles contract, lens becomes thicker and increases refractive power; for distant objects, muscles relax and lens flattens.
- The adjusted lens converges the light rays so that they form a sharp image on the retina, where photoreceptors convert the image into neural signals sent to the brain.

3. Calculations / intermediate steps
- No numerical calculation is required. Conceptually, bending (refraction) increases or decreases according to lens curvature to place the focal point on the retina.

4. Why the correct answer is correct
- Focusing light on the retina is the lens’s chief optical role. Its shape-change ability directly controls where converging rays meet, ensuring clear images are projected onto the retinal surface.

5. Why the other options are incorrect
- Protect the surface of the eye: protection is primarily the cornea, eyelids, and tear film, not the internal lens.
- Increase vision in low-light conditions: low-light sensitivity is largely determined by rod photoreceptors and pupil dilation controlled by the iris, not by the lens.
- Move the eye side to side: extraocular muscles attached to the eyeball control eye movement, not the lens.

6. Conclusion
Therefore, the correct choice is “focus light on the retina at the back of the eye.” This matches the provided answer.

Question at position 5 In the eye, the lens functions tofocus light on the retina at the back of the eye.protect the surface of the eye.increase vision in low-light conditions.move the eye side to side.Clear my selection单项选择题

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