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A double-slit set up produces bright fringes for sodium light ( = 589 nm) such that...

A double-slit set up produces bright fringes for sodium light ( = 589 nm) such that the first bright fringe is at an angle of 0.20°.

(a) What is the slit separation?

(b) Suppose the two slits, the screen, and intervening space are immersed in water, but the source of the sodium light stays outside the water. What will be the wavelength of the sodium light once it enters the water?

(c) What is the location of the first bright fringe (in degrees) for the situation described in part (b)?

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