In dry imagers, which factor is used to reveal the latent image on the film?

• A. Heat
• B. Light
• C. Chemical Development
• D. Magnetic Field

Answer: (A)

Latent image is invisible until it’s developed. In dry imaging, the development step is accomplished by applying heat, which activates a solid-state developer in the film and converts the exposed silver halide grains into metallic silver, making the image visible. Heat directly drives this development without liquids. Light would risk fogging the film, chemical development requires liquid chemicals, and a magnetic field has no role in revealing the latent image.