plane waves in a ripple tank are reflected from a straight barrier at the same angle to the barrier as incident waves because their speed and wavelength do not charge on reflection.
plane waves crossing a boundary between two different matrials are refracted unless they cross the boundary at normal incidence
at a boundary between two different materials, waves can be transmitted or absorbed.
refraction occurs at a boundary between two different materials because the speed and wavelength of the waves change at the boundary
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