The Widths of the Lines Produced by Monochromatic Light Falling

question 25

Multiple Choice

The widths of the lines produced by monochromatic light falling on a diffraction grating can be reduced by:

• A)increasing the wavelength of the light
• B)increasing the number of rulings without changing their spacing
• C)decreasing the spacing between adjacent rulings without changing the number of rulings
• D)decreasing both the wavelength and the spacing between rulings by the same factor
• E)increasing the number of rulings and decreasing their spacing so the length of the grating remains the same