# Finding Unit Vectors With Two Points

Then using the dot product of the two vectors allows the cosine of the angle to be known and the cross product determines the sign How to find the angle between two vectors computes the direction of a refracted ray if i specifies the normalized() direction of the incoming ray and n specifies the normalized() normal vector of the interface of two optical media (e Storage Arrays and Tuples []How to Find Scale Factor Takes a point and a polygon layer and counts the number of points from the point layer in each of the polygons of the polygon layer Learn in this FAQ how to set Vector up how Vector connects to the internet and where to find troubleshooting steps if you encounter any connection issues In order for you to score a 4 or 5 on the AP Physics exam (1 or 2) it is important for you to follow the tips outlined below The haversine formula is an equation important in navigation giving great-circle distances between two points on a sphere from their longitudes and latitudes