Incident ray or ray of incidence.
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When light hits an object, it bounces off and travels in all directions. Some of this light enters our eyes, allowing us to see the object. When this light hits a mirror, it reflects off the mirror's surface and back towards our eyes, creating the reflection of the image.
The light is reflected from Barry's tie surface towards the mirror, then bounces off the mirror surface and travels to Barry's eyes. Barry sees the reflected light, which allows him to see his tie's color and pattern without directly looking at it.
The phenomenon is called refraction. When light travels from air to glass, it bends due to the change in speed caused by the different optical densities of the two mediums, leading to the refraction of light.
A periscope uses two mirrors – a top mirror and a bottom mirror. The top mirror reflects light from above and directs it downward towards the bottom mirror. The bottom mirror then reflects the light out towards the observer's eye, allowing them to see objects that are not in their direct line of sight.
The ray of light that strikes a mirror is called an incident ray.