Question

With the help of _____eye-lens changes its focal length.

• A. Aqueous humor
• B. Cornea
• C. Ciliary muscle
• D. Pupil

Answer 1

The Correct Option is C

To solve the problem, we need to identify the part of the eye that helps the eye-lens change its focal length.

1. Understanding the Function of the Eye-Lens:
The eye-lens changes its focal length to focus light from objects at various distances onto the retina. This ability is known as **accommodation**.

2. Role of Ciliary Muscles:
Ciliary muscles are responsible for changing the shape of the eye-lens. By contracting or relaxing, they make the lens thicker or thinner, thereby changing its focal length.

3. Evaluating the Options:
- (A) Aqueous humor: A fluid that maintains pressure, not involved in lens adjustment.
- (B) Cornea: Helps in focusing light but not in changing focal length.
- (C) Ciliary muscle: Correct answer – controls the lens shape.
- (D) Pupil: Regulates the amount of light entering the eye, not the lens shape.

Final Answer:
The correct answer is option (C): Ciliary muscle.