Mon Prof Augmenté
Light on Film Grains
Age 14 · Chemistry
Light passing through a lens strikes silver halide grains in film. Where it hits, the grains turn into tiny metallic silver specks, and a developer makes those specks grow into a visible image.
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In the picture
- Convex lens: bends the light beam into a narrow path.
- Light beam: travels down through the film.
- Gelatin layer: clear material holding the grains.
- Pale silver halide grain: grain away from the light.
- Dark metallic silver speck: grain changed by the light.
Examples
- A photographic film camera uses light-sensitive grains to record a scene.
- Dental X-ray film darkens where X-rays pass through teeth and bone.
Key takeaways
- Light changes silver halide grains into tiny metallic silver specks.
- A developer enlarges those specks so the invisible pattern becomes visible.
Quiz: Light on Film Grains (Age 14)
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What does light do to silver halide grains in film?
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What does the developer do?
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What is true of silver halide grains that light does not hit?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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