refract

To deflect (light, for example) from a straight path by refraction.

To alter by viewing through a medium.

To determine the refraction of (an eye, for example).

To bend back sharply or abruptly; especially, in optics, to break the natural course of, as of a ray of light; deflect at. a certain angle on passing from one medium into another of a different density. See refraction.

To bend sharply and abruptly back; to break off.

To break the natural course of, as rays of light orr heat, when passing from one transparent medium to another of different density; to cause to deviate from a direct course by an action distinct from reflection.

To change direction as a result of entering a different medium

To cause (light) to change direction as a result of entering a different medium.

subject to refraction

determine the refracting power of (a lens)