24-6 Diffraction Grating
24.7 The Spectrometer and Spectroscopy
24.8 Interference by Thin Films
24-10 Polarization
Objectives:
1. What is the purpose of a diffraction grating in terms of the study of light?
2. Why do more diffraction slits yield sharper images?
3. What is the functional application of a spectroscope?
4. Compare and contrast an absorption and emission spectrum.
5. Why are colors produced on thin film like soap bubbles?
6. How are Newton’s rings produced and how do they apply to the study of the
wave nature of light?
7. How is the wave action of light affected by polarization?
8. Compare and contrast polarized and unpolarized light.
Homework Problems: 28-34 even, 40-44 even, 53-57
Vocabulary to Know For These Sections:
Diffraction grating
Interference grating
Transmission grating
Reflection grating
Spectrum
Spectrometer
Spectroscope
Line Spectrum
Continuous spectrum
Absorption lines
Emission lines
Thin film interference
Incident light
Newton’s rings
Reflection phase shift
Polarized
Linearly polarized
Plane Polarized
Oscillation
Transverse waves
Electromagnetic waves
Unpolarized
Polaroid sheet
Transmission axis
Electric field
Intensity
Amplitude
Polarizer
Analyzer
Polarizing angle
Brewster’s angle
Diffraction Grating
1. What are the types of gratings?
2. What is the difference between a double slit and multiple slit pattern?
3. What happens when there are more lines in a grating?
4. What happens when light that is not monochromatic strikes a grating?
The Spectrometer and Spectroscopy
1. What is the purpose of a spectroscope?
2. How does a spectroscope work?
3. What devices are used in spectroscopes to produce spectrums?
4. Discuss the types of spectrums that can be created?
5. Explain three reasons spectroscopy is useful tool.
Interference by Thin Films
1. Where can we see examples of thin film interference and what are its limitations?
2. How does tin film interference occur?
3. What are Newton’s Rings and how are they produced?
4. How can flat plates of glass be used to produce thin film effects?
5. How do soap bubbles produce thin film effects?
6. Explain the important applications of thin film interference.
7. Discuss the types of thin film interference.
Polarization
1. What types of waves are not polarized?
2. Discuss Maxwell’s theory of light in terms of polarization.
3. List some examples of unpolarized light.
4. How can polarized light be obtained from unpolarized light?
5. What occurs when two polaroids are crossed?
6. Explain the purpose of Polaroid glasses.
7. Why is Brewster’s angle important to the study of light.