The film duplicator in a dental practice uses which type of light to expose film?

• A. White Light
• B. Red Light
• C. Blue Light
• D. Green Light

Answer: (A)

Duplicating film is designed to be exposed by light across the full visible spectrum to produce a faithful copy of the original radiograph. The film duplicator uses a bright white light because it provides that broad-spectrum exposure, capturing the complete tonal range of the image. Using colored lights, or safety red light typical for ordinary radiographs, would not deliver the full-spectrum exposure and could fog or degrade the duplicate. So, white light is used to ensure an accurate, high-quality copy.