Question

what is diffraction?

Answer 1

Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. 
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Answer 2

Hi friend,

Here is your answer,

When a very small object obstruct the path of light then light has a tendency to bend around it and not go in a straight light.

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