7. If a monochromatic light source of wavelength 490 nm is normally incident on a grating of 500 lines per mm, and the grating is 1.2 m from the screen, what is the distance between the second-order images?
8. A yellow laser of wavelength 610 nm is passed through a diff raction grating with 4.33 × 105 lines per metre. Calculate the angle of deviation for the second-order images and determine the maximum number of orders possible.
CHAPTER 18 EXERCISE 18B c = 3 × 108 m s–1
1. When the visible spectrum is passed through a diff raction grating, which colour is diff racted the most, and why?
2. Why does monochromatic light appear as discrete orders when passed through a grating but white light will appear as spectrums?
3. At what angle will red light of 700 nm deviate when normally incident on a grating of 600 lines per mm? By how many degrees will this change if indigo light of wavelength 420 nm is passed through the same grating (assume you are looking at the fi rst-order deviation)?
