Question

A UV light is passed from an optical fiber into air at an angle of 45° and the refractive index of the fiber is √2. The angle of refraction will be?

• A. 90°
• B. 30°
• C. 60°
• D. 0°

Answer 1

Answer:

A. 90°

Read Explanation:

The angle of refraction is 90°, meaning the light will travel along the interface between the optical fiber and air. This particular angle of incidence is called the critical angle. Here the angle of refraction is 90 degrees. When the angle of incidence is greater than the critical angle, the incident ray is reflected back to the medium

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