https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:coordination-and-control/x2a084a90105205d2:mammalian-sense-organs/v/human-eye-pk 2025-12-18T00:30:56.558401705Z Human eye Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Human eye Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/0AOeXHOQFDw.mp4/0AOeXHOQFDw.mp4 622 Human eye and the camera https://www.khanacademy.org/computing/pixar/virtual-cameras/virtual-cameras-1/v/optics1-final 2023-07-31T16:40:28.830178554Z What is a pinhole camera? Cameras use apertures to control the amount of light entering the camera and reaching the image plane. Apertures allow only specific light rays from the scene to pass through, creating a clear image. Pinhole cameras exemplify this concept, using a tiny hole as the aperture to filter out unwanted light rays and form an inverted image on the image plane. video https://cdn.kastatic.org/googleusercontent/XSXVktGnDnHd1FhP8vvxnXYsODQdtJ1bMiYRgvDe5OSWP9ylvIAOmRPXG7hiXvkGSl0xdr3YwTacPaO6QIOVuJjNUQ What is a pinhole camera? Cameras use apertures to control the amount of light entering the camera and reaching the image plane. Apertures allow only specific light rays from the scene to pass through, creating a clear image. Pinhole cameras exemplify this concept, using a tiny hole as the aperture to filter out unwanted light rays and form an inverted image on the image plane. https://cdn.kastatic.org/ka-youtube-converted/jhBC39xZVnw.mp4/jhBC39xZVnw.mp4 189 Human eye and the camera https://www.khanacademy.org/computing/pixar/virtual-cameras/virtual-cameras-1/a/simple-pinhole-camera 2021-04-29T07:56:41Z Simple pinhole camera article https://www.khanacademy.org/computing/pixar/virtual-cameras/virtual-cameras-1/v/virtual-camera-3 2023-07-31T16:40:28.830178554Z Camera lenses Now we'll add a lens to our camera and explore the idea of an f-stop. Pinhole cameras use lenses to focus light and create sharp images. The lens curvature affects the focal point, and the focal length determines the field of view. Aperture size controls light exposure, measured in F Stops. Wide angle, long, and 50mm lenses offer different perspectives. video https://cdn.kastatic.org/googleusercontent/1xTz2Fzc4cDZOc4S-eNQbC5OJi4OR8ojjDddNH20opx7IPZ2uYQYvvtjsVaSBusKxfj3pQnmhTIjI4_l3SZLoOPq Camera lenses Now we'll add a lens to our camera and explore the idea of an f-stop. Pinhole cameras use lenses to focus light and create sharp images. The lens curvature affects the focal point, and the focal length determines the field of view. Aperture size controls light exposure, measured in F Stops. Wide angle, long, and 50mm lenses offer different perspectives. https://cdn.kastatic.org/ka-youtube-converted/Q5Jat06VM6o.mp4/Q5Jat06VM6o.mp4 213 Human eye and the camera