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It does both to a certain extent but its main purpose is to focus light.
Focus light onto the film
The lens redirects light onto the sensor until the camera thinks it's in focus.
A camera uses lenses to focus light rays and record an image of an object on photographic film.
Adjustment knobs are used to focus light in a light microscope.
Adjustment knobs are used to focus light in a light microscope.
The lens of the camera is responsible for focusing incoming light rays onto the camera sensor. The lens can be adjusted to control the focus and sharpness of the image being captured.
The lens redirects light onto the film until the camera thinks it's in focus.
The distance it will focus will depend upon the type of camera being used. It also depends upon which 300 mm lens you are using.
A camera primarily uses refraction to focus light onto the sensor/film. Lenses in the camera refract light to create a sharp image, adjusting focus by changing the distance between the lens elements. Reflection may occur within the camera, such as off mirrors or other internal components, but it is not the primary mechanism for forming the image.
A camera is a tool that uses a lens to focus light and create images. It works by allowing light to pass through the lens and onto a light-sensitive surface, such as film or a digital sensor, where the image is captured and stored. Cameras are used in photography, cinematography, and various other applications to capture images of the surrounding environment.