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

question 77

Multiple Choice

Monochromatic light is normally incident on a diffraction grating.The m^th order line is at an angle of diffraction $\theta$ 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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