Which statement describes oblique incidence?

Which statement describes oblique incidence?

• A. It occurs at 90 degrees
• B. It occurs at any angle other than 90 degrees
• C. It occurs only when the boundary is rigid
• D. It occurs at all times equally

Answer: (B)

Oblique incidence is about how a wave meets a boundary: it arrives at an angle rather than head-on. In this context, oblique incidence is described as occurring for any angle except when the wave travels exactly along the boundary, which corresponds to 90 degrees relative to the boundary. So the statement that oblique incidence occurs at any angle other than 90 degrees matches that idea. The other options don’t fit because hitting the boundary parallel to it (90 degrees) is the grazing case, not oblique; the rigidity of the boundary doesn’t determine incidence type; and saying it happens all the time equally ignores the role of the angle.

Oblique incidence is about how a wave meets a boundary: it arrives at an angle rather than head-on. In this context, oblique incidence is described as occurring for any angle except when the wave travels exactly along the boundary, which corresponds to 90 degrees relative to the boundary. So the statement that oblique incidence occurs at any angle other than 90 degrees matches that idea. The other options don’t fit because hitting the boundary parallel to it (90 degrees) is the grazing case, not oblique; the rigidity of the boundary doesn’t determine incidence type; and saying it happens all the time equally ignores the role of the angle.