Asked by angy
A screen is placed 50cm away from a slit lit by a monochromatic light of wavelength 690nm. The distance seperating the first dark fringe and the third dark fringe in the diffraction pattern is 3mm. Calculate the width of the slit.
Answers
Answered by
bobpursley
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/sinslit.html
Well, you have y1-y2 as 3mm
and m1+1=m2
so in the two equations for the dark minimus, subtract one from the other to end with one equation using your indicie and the 3mm.
Well, you have y1-y2 as 3mm
and m1+1=m2
so in the two equations for the dark minimus, subtract one from the other to end with one equation using your indicie and the 3mm.