Light of wavelength 600 nm passes though two slits separated by 0.25mm and is observed on a screen 1.5m behind the slits. The location of the central maximum is marked on the screen and labeled y = 0.

At what distance, on either side of y = 0, are the m = 1 bright fringes? y1=3.6mm

A very thin piece of glass is then placed in one slit. Because light travels slower in glass than in air, the wave passing through the glass is delayed by 5.0 �10?16s in comparison to the wave going through the other slit. What fraction of the period of the light wave is this delay? Delta(t)/T = 0.25

With the glass in place, what is the phase difference ??0between the two waves as they leave the slits? delta(phi) = 1.6rad

QUESTION:

By how far does the central maximum move?

Express your answer to two significant figures and include the appropriate units.