## University Physics with Modern Physics (14th Edition)

Equation 35.6 gives the position of the mth bright band in a 2-slip interference pattern. $$y_m=R\frac{m \lambda}{d}$$ When the apparatus is immersed in water, the wavelength of the light decreases by a factor of 1.33, water’s index of refraction. All of the fringes move toward the centerline of the pattern, making the pattern more narrow by a factor of 1.33.