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12th Physics 2018 Set1 Delhi Board Paper Solution

Question 26

When a tiny circular obstacle is placed in the path of the light from a distance source, a bright spot is seen at the centre of the obstacle. Explain why.

Answer

When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. This is because light waves are diffracted from the edge of the circular obstacle, which interferes constructively at the centre of the shadow. This constructive interference produces a bright spot.

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