A Diffraction Pattern Is Produced on a Viewing Screen by Illuminating

Multiple Choice

A diffraction pattern is produced on a viewing screen by illuminating a long narrow slit with light of wavelength $\lambda$ .If $\lambda$ is increased and no other changes are made:

A) the intensity at the center of the pattern decreases and the pattern expands away from the bright center
B) the intensity at the center of the pattern increases and the pattern contracts toward the bright center
C) the intensity at the center of the pattern does not change and the pattern expands away from the bright center
D) the intensity at the center of the pattern does not change and the pattern contracts toward the bright center
E) neither the intensity at the center of the pattern nor the pattern itself change