One way that you can demonstrate for yourself that light is a wave is to observe the pattern formed at your eye by light that passes through a narrow slit formed between your fingers. This experiment is based on the phenomenon known as

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The pattern observed when light passes through a narrow slit is due to wave interference, where light waves overlap and create a pattern of bright and dark fringes. This is a characteristic behavior of waves.

One Way That You Can Demonstrate for Yourself That Light