A double-slit with a separation of 2.1 μm is used with white light. Find the angular width of the first
bright fringe between the violet (lviolet = 400 nm) and red (lred = 750 nm) end of the spectrum. (Assume
two significant digits.)
What exactly are the wavelengths I am using. I am a bit confused.
The Attempt at a Solution
I know the it is the first bright fringe. n=1, d = 2.1um w=?
I am not sure what wavelengths to use.
The formula that I think I could use is
I just don't know where to continue.