A Diffraction Pattern Is Produced on a Viewing Screen by Illuminating

question 68

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

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