The statement explains how diffraction supports the wave model of light
rather than the particle model is Light waves bend around a corner, but particles would not bend.
When a light ray passes through a narrow slit or strikes to any obstacle in its path, the light gets diffracted into different colors of electromagnetic spectrum that are seen on a screen placed at some apart from the slit.
The diffraction means bending of light ray and produce a spectrum. The particle nature says that particles never bend.
Thus, the correct option is A.
Learn more about diffraction.
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