## Core Concept
The power of the normal eye is essentially its refractive power, measured in diopters (D). The human eye can focus on objects at various distances through a process called accommodation, which involves changing the shape of the lens. The total refractive power of the eye is approximately 60 diopters.

## Why the Correct Answer is Right
The correct answer, , represents 60 diopters. This value is correct because the eye's total optical power is about 60 diopters, which allows it to focus light from distant objects onto the retina. This power comes from the combined refractive indices of the cornea (about 45 diopters), the lens (about 15 diopters), and to a lesser extent, the aqueous and vitreous humors.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because it underestimates the total refractive power of the eye. While the lens itself has a power of around 15 diopters, the entire eye has a much higher total power.
* **Option B:** - This option suggests a power that is significantly lower than the actual total power of the eye, making it incorrect.
* **Option D:** - This option overestimates the power of the eye. While the cornea contributes a significant portion of the eye's refractive power, the total power of the eye is not as high as 100 diopters.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the cornea contributes the majority of the eye's refractive power (about 45 diopters), with the lens contributing the remainder (about 15 diopters). This is crucial for understanding how corrective lenses and refractive surgeries work.

## Correct Answer Line
**Correct Answer: C. **