Monochromatic Light Is Normally Incident on a Diffraction Grating $\theta$ And Has Width W

question 21

Multiple Choice

Monochromatic light is normally incident on a diffraction grating. The m^th order line is at a angle of diffraction angle $\theta$ and has width w. A wide single slit is now placed in front of the grating and its width is then slowly reduced. As a result:

• A) both \(\theta\)and w increase
• B) both \(\theta\)and w decrease
• C) \(\theta\)remains the same and w increases
• D) \(\theta\)remains the same and w decreases
• E) \(\theta\)decreases and w increases

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