When monochromatic light traveling in air strikes a flat glass surface with index of…
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
When monochromatic light traveling in air strikes a flat glass surface with index of refraction 1.50 at normal incidence, which statement correctly describes the phase of the wave reflected from the air–glass interface?
(a) The reflected wave experiences no phase change.
(b) The reflected wave advances in phase by 90∘.
(c) The reflected wave is shifted by 180∘ (π radians).
(d) The reflected wave’s wavelength decreases as it encounters the glass, so its phase remains unchanged.