91Ó°ÊÓ

Structures on a bird feather act like a reflection grating having 8000 lines per centimeter. What is the angle of the first-order maximum for 600 -nm light?

Blue light of wavelength 450 nm falls on a slit of width \(0.25 \mathrm{mm}\). A converging lens of focal length \(20 \mathrm{cm}\) is placed behind the slit and focuses the diffraction pattern on a screen. (a) How far is the screen from the lens? (b) What is the distance between the first and the third minima of the diffraction pattern?

What is the maximum number of lines per centimeter a diffraction grating can have and produce a complete firstorder spectrum for visible light?

Show that a diffraction grating cannot produce a second-order maximum for a given wavelength of light unless the first-order maximum is at an angle less than \(30.0^{\circ}\)