Carefully mark in the angle of refraction, r, between the refracted ray and the normal. Measure the angle of refraction with a protractor and record in the table.

Discover how to use ray tracing to measure angles of incidence and refraction in a practical experiment, then plot the results on a graph.

We experimentally demonstrate negative refraction of the longitudinal elastic wave at the deep-subwavelength scale in the metamaterial fabricated in a stainless steel plate.