http://www.ck12.org Chapter 15. Diffraction and Interference of Light
Practice
Questions
Follow up questions:
- How does a diffraction grating differ from single or double slit?
- What happens when you increase the number of slits in a diffraction grating?
Review
Questions
- White light is directed toward a diffraction grating and that light passes through the grating, causing its
monochromatic bands appear on the screen. Which color will be closest to the central white? - Three discrete spectral lines occur at angles of 10.1°, 13.7°, and 14.8° respectively in the first order spectrum.
If the grating has 3660 lines/cm, what are the wavelengths of these three colors of light? - A 20.0 mm section of diffraction grating has 6000 lines. At what angle will the maximum bright band appear
if the wavelength is 589 nm? - Laser light is passed through a diffraction grating with 7000 lines/cm. The first order maximum on the screen
is 25° away from the central maximum. What is the wavelength of the light?
- diffraction grating:A glass, plastic, or polished metal surface having a large number of very fine parallel
grooves or slits and used to produce optical spectra by diffraction.
This chapter discussed the nature of interference and interference patterns, the diffraction of light waves, and the use
of diffraction gratings. Regardless of the number of slits, light shining through small slits in a blocking object will
create an interference pattern. In single slits, this pattern is a result of light diffraction around the back of each side
of the slit, while double slits and diffraction gratings create interference due to light shining through each slit.