NCIDQ IDFX Practice Exam

How is reflected glare defined?

1. Bright light shining directly into the eyes

2. Light reflected from surfaces into the observer's gaze

3. Light that casts shadows on work surfaces

4. Excess downward light that creates discomfort

The correct answer is: Light reflected from surfaces into the observer's gaze

Reflected glare is defined as light that is reflected from surfaces and enters the observer's field of vision, causing visual discomfort or interference. This phenomenon occurs when light bounces off shiny or reflective surfaces, such as glass, polished floors, or water, and reaches the eyes at angles that result in bright, distracting spots of light. Understanding reflected glare is essential in design, as it impacts both aesthetic appeal and the comfort of occupants in a space. In contrast to direct glare, which arises from a bright light source seen directly, reflected glare specifically involves surfaces that redirect light towards a viewer. The other options describe different lighting phenomena: bright light shining directly into the eyes pertains to direct glare; casting shadows on work surfaces relates to inadequate lighting and can lead to visibility issues rather than discomfort from glare; and excess downward light generating discomfort refers to issues related to over-illumination rather than reflection. Hence, only the definition focused around light being reflected into the observer’s gaze accurately describes reflected glare.