There is no special name for that. However, the rate of such a change is called acceleration.
Velocity
velocity is the name given to speed in a specific direction.
Velocity :)
'Refraction' and 'reflection' both change the direction of light.
Refraction
One way to not accelerate an object is by trying to reduce its speed. In physics, a change in speed or in direction is called acceleration. One way not to accelerate an object is to change its name.
Velocity is the measurement of the rate and direction of change in the position of an object. It is a vector quantity; both magnitude and direction are required to define it. The scalar value of velocity is speed. For example, a speed of "5 meters per second" is a scalar and not a vector measurement, whereas a velocity of "5 meters per second east" is a vector measurement stating both speed and direction.
refraction
Speed. however, if it is in a givern direction, e.g. ,speed in a northerlu direrction , then it is velocity.
Reflection-when light change the direction of motion within same medium. Refraction-change of direction when moving to another medium.
It can only be accelerated or decelerated, by adding to, or deleting from, the applied force causing the motion, or by increasing or decreasing the (opposing) frictional force. Acceleration includes starting. Deceleration includes stopping. Directional change may be imposed without causing a change in velocity, although practically, this change would be difficult to accomplish.
i want to change the name of our country's is philipeace