Discussion
The transverse nature of electromagnetic waves is confirmed by the phenomenon of
Answer: B
The transverse nature is confirmed by polarization.
Only transverse waves can be polarized: their vibrations are perpendicular to the direction of travel and can be restricted to one plane. When light passes through a polaroid and then a second one is rotated, the transmitted intensity varies and can fall to zero, which shows the vibrations have a direction across the beam.
Diffraction and interference occur for all waves, including longitudinal sound waves, so they prove wave nature but not transverse nature. The photoelectric effect shows the particle nature of light, and total internal reflection is a refraction effect.
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