Optics: How a Camera Lens Forms an Image
How light becomes an image inside a camera
1:00 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
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How a Lens Forms an Image
Let's see how a camera lens creates an image.
Inside the Camera
A camera has a lens that gathers light, an aperture that controls the amount of light, and an image sensor that captures the image.
Focal Point and Focal Length
A convex lens bends light, bringing rays parallel to the axis together at the focal point. The distance from the lens to the focal point is the focal length.
Upside-Down Image
Light from one point on an object also passes through the lens and meets again at one point, forming an upside-down image on the sensor.
Focusing
Focusing means moving the lens back and forth so the image forms on the sensor. For closer objects, the lens moves farther from the sensor.
Combining Lenses
Each color of light bends by a different amount, so a single lens makes colors blur. This chromatic aberration is reduced by combining lenses.
Bending Light into an Image
A lens bends and gathers light to form a sharp image on the sensor.
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