Two slits are made one millimetre apart and the screen is placed one meter away. What is the fringe separation when blue-green light of wavelength \(500\) nm is used? 
1. \(0.5\) mm
2. \(0.3\) mm
3. \(0.05\) mm
4. \(0.03\) mm

Consider the following statements and then mark the incorrect statement/s.

1. Only b and c
2. Only a
3. Only a, b and c
4. All of the above