Light of wavelength $\lambda$ is normally incident on some plane optical device. The intensity pattern shown is observed on a distant screen ($\theta$ is the angle measured to the normal of the device). The device could be:
A) a single slit of width W
B) a single slit of width 2W
C) two narrow slits with separation W
D) two narrow slits with separation 2W
E) a diffraction grating with slit separation W

Question

Light of wavelength $\lambda$ is normally incident on some plane optical device. The intensity pattern shown is observed on a distant screen ($\theta$ is the angle measured to the normal of the device). The device could be: 
A) a single slit of width W 
B) a single slit of width 2W 
C) two narrow slits with separation W 
D) two narrow slits with separation 2W 
E) a diffraction grating with slit separation W

Quizplus · Accepted Answer

The Answer of Light of wavelength $\lambda$ is normally incident on some plane optical device. The intensity pattern shown is observed on a distant screen ($\theta$ is the angle measured to the normal of the device). The device could be: 
A) a single slit of width W 
B) a single slit of width 2W 
C) two narrow slits with separation W 
D) two narrow slits with separation 2W 
E) a diffraction grating with slit separation W

Light of Wavelength λ\lambdaλ Is Normally Incident on Some Plane Optical Device

Light of Wavelength $\lambda$ Is Normally Incident on Some Plane Optical Device