Field of view.
They are sometimes but not always
Poet of the camera.
Night vision cameras convert ambient light photons into electons. Those electrons are amplified by an electrical and chemical process and converted into visible light.
Most digital camera sensors are sensitive to a small range of IR, as well as visible light.
Mounting a camera describes the process of securing a camera to a more stable base. This could be as simple as putting it on a tripod or mounting it to a more complicated rig.
Visible light.
Throw a snowball on camera 2 when the cameras are off ;)
The LED itself is visible, the light it emits is not. You can "see" the light by looking at it through a camera, for example the one on your cellphone!
An answer to this riddle is "A camera." Cameras reflect images like a mirror, but the camera itself is not visible in its own images.
To determine if your neighbors have a security camera pointed at your backyard, you can politely ask them or visually inspect their property for any visible cameras.
The only advantage of having a instant film camera is being able to have a physical picture immediately. The grain on those pictures are horrible to the pictures you will get from even the cheapest digital camera.
Lines are visible when taking a picture of a computer screen because of the refresh rate of the screen and the shutter speed of the camera. The refresh rate of the screen and the shutter speed of the camera may not be synchronized, causing the lines to appear in the photo.