DSLR CAMERA
Law of Refraction
Refraction is caused by the change in speed experienced by a wave when it changes medium. The incident ray shows the direction the light travels as it approaches the new medium. The refracted ray shows the direction the light travels after it's crossed into the new medium. The normal is a line that is drawn perpendicular to both mediums. The angle that the incident ray makes with the normal line is referred to as the angle of incidence. The angle that the refracted ray makes with the normal line is known as the angle of refraction. The angle of incidence and refraction are symbolized as "theta-i" and "theta-R". Greater refraction occurs when the difference between the 2 mediums index of refraction is .
Refraction in a DSLR Camera
As light reflects off the object that is being taken a picture of, the reflected light rays come in at different angles towards the camera lenses. Once hitting the series of lenses and aperture, all the light rays angle in the same direction (parallel to the photographed object). This occurs because of refraction. Since light is fastest in vacuum (air), the collision of the light rays with the series of optically denser camera lenses causes the rays to bend, and refract. This process is neccessary because it helps create the image seen from the eyepiece of the camera.
