1. The problem statement, all variables and given/known data A scientist decides to do the double-slit experiment in a vertical tube, with the slits at the top and a viewing screen at the bottom as shown. With red light from a HeNe laser (632 nm) a nice pattern forms on the viewing screen, with the bright spots 1.00 cm apart. Now the scientist fills the tube up with water. What is the separation of the bright spots now? 2. Relevant equations i used v=c/n v=λf y=m(λ)L/d 3. The attempt at a solution λ=c/nf plugged that into y(initial)=m(λ)L/d, i used 1.33 as the index number. y(final)=m(λ)L/d to find the new separation, the m, L, d cancel out leaving y=λ or y(final)=c/nf c=3x10^8, n=1.33, f=632x10^-9 meters, i got 3.5x10^14 which seems to me to be really large...please help its due tonight, thanks!