"light ray" is correct and usable in written English.
You could use it when referring to a beam of light, such as in the sentence, "The sun's bright light rays shone through the window."
Ray tracing follows an imaginary light ray from the viewpoint through each point in a scene.
Consists of special kind of cloth and special light ray.
Why is a light ray so fast and a whisper so slow?
Closer to the city centre, a towering light ray, the creation of Mexican artist Rafael Lozano-Hemmer, pierced the clouds.
Last act of Westinghouse Electric Circus: escaping convict intercepts light ray and starts revolver firing at his skull.
One Dutch girl in a silver jacket slid into it, like a light ray entering a blind eye.
In geometric terms, the right angle at which the light ray meets the boundary is called the normal.
The path of a light ray along this axis is perpendicular to the surfaces and, as such, will be unchanged.
Bulgakov's novella charts zoologist Professor Persikov's chance discovery of a strange light ray that accelerates growth and reproduction in living creatures.
The path of a light ray bends (refracts) when it passes from one transparent medium to another e.g., from air to glass.
The same law of reflection is followed for both sound and light, so that focusing a sound wave is equivalent to focusing a light ray.
