 In a case such as this, where the gravitational field is uniform, the change in wavelength is given by

where formula_2 is the change in height.Since this prediction arises directly from the equivalence principle, it does not require any of the mathematical apparatus of general relativity, and its verification does not specifically support general relativity over any other theory that incorporates the equivalence principle.When the field is not uniform, the simplest and most useful case to consider is that of a spherically symmetric field.