Certified Fiber Optics Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

The appropriate instrument for measuring light in fiber optics is a photometer. A photometer specifically measures luminous intensity or the amount of light energy coming from a source. This is crucial in fiber optics to assess the performance of fiber circuits and ensure they meet the necessary specifications for signal strength and quality.

Using a photometer allows technicians to evaluate parameters such as power loss, signal levels, and overall light transmission through the fiber, which are essential for diagnosing issues and maintaining fiber optic networks.

In contrast, while a camera can capture images of light and might be useful in certain contexts, it does not provide quantitative measurements of light intensity in the way a photometer does. A microscope is designed for magnification and observation of small objects, making it unsuitable for measuring light levels in fiber optics. Finally, "Measure" is not a specific instrument; it typically refers to the action of quantifying a property but lacks the definition of what tool is used for such measurements in the context of fiber optics.