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Describe the simplest diffraction patter...

Describe the simplest diffraction pattern.

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According to figure, keeping the edges of the two razor blades parallel to each other a light bulb can be seen from that edge, the bright and dark fringes appear around the bulb filament.
Looking at the finger of the hand, you can see the diffraction pattern.
Looking at the light bulb from the khadi cloth, bright and dark fringes can be seen around the lighted part of the bulb.
If there is a pinhole on the far and opaque screen in front of the sodium lamp then light and dark fringes are seen on the screen.
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