Upon observing an interference pattern produced onto a screen, how could you identify whether a single slit, double slit, or diffraction grating produced the pattern?

(a) Distinguish between diffraction and refraction. (b) What is dispersion, and how is it related to diffraction and refraction?

Would you see the same thin film interference pattern in a film of soap surrounded by air and a film of soap on glass? Why or why not?

A double slit apparatus is held 1.2 m from a screen. (a) When red light ( = 600 nm) is sent through the double slit, the interference pattern on the screen shows a distance of 12.5 cm between the first and tenth dark fringes. What is the separation of the slits? (b) What will be the difference in path length for the waves travelling from each slit to the tenth nodal line?

2. Blue light ( = 475 nm) is sent through a single slit with a width of 2.1 m. What is the maximum possible number of bright fringes produced on the screen?

A diffraction grating gives a second-order maximum at as angle of 31 for violet light ( = 4.0 10² nm). If the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating?