Coherent light passes through two narrow slits which are 0.4mm apart. As a result the third maximum is created at angle

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Coherent light passes through two narrow slits which are 0.4mmapart. As a result the third maximum is created at angle of 1.5degrees from the central axis. A) Calculate the wavelength of this light, in meters
B) If the screen is 5 meters from the slits, how far is this 3rdmaximum from the central maximum?
C) Calculate the angle to the 6th minimum of the interferencepattern.
D) How many total maxima are projected with a 20 degree angle tothe central axis? (Both sides)