When you click the camera the shutter behind the lens of the camera opens briefly and lets in the light on to the film. I am no specialist and this is what I learnt in school.
The energy that enters any kind of camera through the lens is called light.
An aperture is a hole where light travels through. Therefore in any camera there is always an aperture - including digital cameras - even if it is fixed
Digital camera sensors work by converting light into electrical signals. When light enters the camera through the lens, it hits the sensor, which is made up of millions of tiny light-sensitive pixels. Each pixel measures the intensity of light it receives and converts it into an electrical signal. These signals are then processed by the camera's image processor to create a digital image.
Digital camera
Electric Light Bulb
Most digital camera sensors are sensitive to a small range of IR, as well as visible light.
light
A digital SLR camera and a DSLR camera are the same thing. "DSLR" stands for "digital single-lens reflex," which refers to the type of camera that uses a mirror mechanism to reflect light from the lens to an optical viewfinder. This allows the photographer to see exactly what the camera sees through the lens.
It focuses the light entering the camera onto the sensor.
The Color of Canon SD890 Digital camera is light blue, pale blue.
Any film camera with a light meter, and every digital camera, has a sensor that will do that.
A digital camera has a surface that it made up of many tiny electronic devices that produce signals when light coming in through the lens falls on them. These signals are recorded inside the camera. A 35mm film camera uses film as that surface. Film changes chemically when touched by light. This film is later removed from the camera and put in a chemical solution that makes it possible to see the image.