2.4 - Waves Flashcards
(11 cards)
what are stationary waves formed by?
the interference of two waves, of the same frequency and amplitude, travelling in
opposite directions
what displacement do nodes have on a stationary wave?
no displacement (nodes-placement)
what is meant if 2 waves are coherent?
they have a constant phase relationship
for 2 waves to constructively interfere, they must…
be coherent and exactly in phase
for 2 waves to destructively interfere, they must…
be coherent and exactly out of phase
when does a wave experience a pi phase change?
when it is travelling in a less dense medium and reflects from an
interface with a more dense medium. low to high gives pi
when does a wave not experience a pi phase change?
when it is travelling in a more dense medium and reflects from an
interface with a less dense medium
what is optical path length
OPL is the effective distance travelled by a wave in a vacuum, by taking into account the refractive index of a medium.
what is geometric path length?
the “real world” distance travelled by a wave
what does the division of amplitude refer to?
when a single waves amplitude is divided between 2 new, coherent, waves
a coated (bloomed) lens can be made nonreflective for a specific what
wavelength of light
