A Fiber Optic Is Made by Cladding a Thin Fiber

question 128

Multiple Choice

A fiber optic is made by cladding a thin fiber core of refractive index n₁ = 1.45 with a material of refractive index n₂ = 1.38. The numerical aperture of a fiber optic is defined as NA = n_air sin θ_m, where θ_m is the maximum incident angle so that the light ray is totally internally reflected inside the fiber. The NA for the fiber is

• A) 0.445.
• B) 0.614.
• C) 0.645.
• D) 0.407.
• E) 0.470.

---

Definitions:

Job Enlargement

The process of increasing the number and variety of tasks that an employee performs, aiming to enhance job satisfaction and performance.

Technostress

The stress caused by new and advancing technologies in the workplace.

Job Rotation

A variation of job enlargement in which workers are exposed to a variety of specialized jobs over time.

Herzberg's Two-Factor Theory

A theory proposing that job satisfaction and dissatisfaction arise from two distinct sets of factors—motivators (e.g., achievements) and hygiene factors (e.g., salary).