Discussion
Assertion (A): Wave energy concentrates on headlands and spreads within bays.
Reason (R): Refraction bends the orthogonals together over the shallower water off a headland.
Answer: D
Both are true and the reason gives the mechanism, and this is why headlands erode while bays accumulate sediment. The process tends over time to straighten an irregular coastline. Erosion and deposition are distributed by the wave field.
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