A beam of light from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is:
1.2 cm
1.2 mm
2.4 cm
2.4 mm
As we learnt in
Fraunhofer Diffraction -
- wherein
Condition of nth minima.
slit width
angle of deviation
distance between first daic fringe on both side means width of central maxima
Option 1)
1.2 cm
This is incorrect option
Option 2)
1.2 mm
This is incorrect option
Option 3)
2.4 cm
This is incorrect option
Option 4)
2.4 mm
This is correct option