In a single slit diffraction experiment when a tiny circular obstacle is placed in the path of light from a distance source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why ? State two points of difference between the interference pattern in Young's double slit experiment and the diffraction pattern due to a slit.

In a single slit diffraction experiment when a tiny circular obstacle

1.	In a single slit diffraction experiment when a tiny circular obstacle is placed in the path of light from a distance source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why ? State two points of difference between the interference pattern in Young's double slit experiment and the diffraction pattern due to a slit.
Answer» SOLUTION :In a SINGLE slit diffraction experiment when a tiny circular obstacie is placed in the path of light from a DISTANCE source, a bright spot is seenat the centre of the shadow of the obstacle. Because the waves diffracted from the edges interfere interfere constructively at the centreof shadow thus forming bright spot there.

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