1. Diffraction Grating

2. A large number of equally spaced parallel slits is called a diffraction grating.

4. Why more slits yield sharper peaks?

5. The bright maxima are much sharper and narrower for grating.

6. Spectra Produced by a Grating

7. The Spectrometer and Spectroscopy

10. Interference by Thin Film

12. A beam of light reflected by a material whose index of refraction is greater than that of the material in which it is traveling, changes phase by ½ cycle.

13. Thickness of a soap bubble skin:
A soap bubble appears green ( wavelength 540 nm) at the point on its front surface nearest the viewer. What is its minimum thickness? Assume n=1.35.