Question

Why broad source of light is necessary for observing colours in thin films?

Answer 1

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Due to this reason to observe interference phenomenon in thin films, a broad source of light is required. With a broad source of light, rays of light are incident at different angles and the reflected parallel beams reach the eye or the microscope objective.

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Answer 2

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Due to this reason to observe interference phenomenon in thin films, a broad source of light is required. With a broad source of light, rays of light are incident at different angles and the reflected parallel beams reach the eye or the microscope objective.