Fresnel half period zones are used to describe the contribution of different portions of a wavefront to the intensity at a point in the wave’s path. Each successive zone contributes an equal phase shift but alternates in sign, effectively contributing to the constructive and destructive interference pattern:
- (A) True, as the amplitude of the disturbance from each zone is a function of its area.
- (B) True, as each zone’s radius increases with the square root of its order number.
- (C) True, the area and thus the impact of each zone varies with wavelength, affecting how the wavefront constructs or destructs at a point.
- (D) True, The radii of half period zones are directly proportional to the square root of the wavelength of the light.