OPN Trends—The Nature of Light: What Is a Photon?

Chandrasekhar Roychoudhuri and Rajarshi Roy

This issue of OPN Trends was conceived to bring together different views regarding a question that was first posed in ancient times but remains unanswered today. What, indeed, is “the nature of light”? Many of us still feel perplexed when asked by a student to answer the seemingly simple question, “What is a photon?”

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