A plane wavefront of 7000 Å falls on an aperture. The area of half period zone of the diffraction pattern on screen 1 meter away from the aperture will be :
1
28 × 10-7 m2
2
44 × 10-7 m2
3
22 × 10-7 m2
4
14 x 10-7 m2
5
None of the above/More than one of the above.