Newton's rings can be seen when a planoconvex lens is placed on a flat glass surface (see Problem 3539). For a particular lens with an index of refraction of n = 1.50 and a glass plate with an index of n = 1.80, the diameter of the third bright ring is 0.850 mm. If water (n = 1.33) now fills the space between the lens and the plate, what is the new diameter of this ring?