A 5.3-cm-thick layer of oil (n=1.46) is sandwiched between a1.1-cm-thick sheet of glass and a 2.0-cm-thick sheet of polystyreneplastic (n=1.59). How long (in ns) does it take light incidentperpendicular to the glass to pass through this 8.4-cm-thicksandwich?
A 2.0-cm-wide diffraction grating has 1000 slits. It isilluminated by light of wavelength 570 nm . What are the angles ofthe first two diffraction orders?
