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In a Single Slit Diffraction Experiment, When Tiny Circular Obstacle is Placed in Path of Light from a Distance Source, a Bright Spot is Seen at the Centre of the Shadow of the Obstacle. Explain Why? - Physics

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Question

In a single slit diffraction experiment, when tiny circular obstacle is placed in path of light from a distance source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?

Solution

A bright spot is observed when a tiny circular object is placed in path of light from a distant source in a single slit diffraction experiment because light rays flare into the shadow region of the circular object as they pass the edge of the tiny circular object. The lights from all the edges of the tiny circular object are in phase with each other. Thus, they form a bright spot at the centre of the shadow of the the tiny circular object.

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In a Single Slit Diffraction Experiment, When Tiny Circular Obstacle is Placed in Path of Light from a Distance Source, a Bright Spot is Seen at the Centre of the Shadow of the Obstacle. Explain Why? Concept: Diffraction - The Single Slit.
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