What is ‘diffraction of light’? Explain its two types

1.	What is ‘diffraction of light’? Explain its two types
Answer» The bending of light near the edge of an obstacle or slit and spreading into the region of geometrical shadow is called diffraction of light. Two types of diffraction are: a. Fresnel diffraction: Diffraction pattern in which source of light and screen are kept at finite distance from the slit is called fresnel diffraction. eg: Diffraction of straight edge, small opaque disc, narrow rectangular slit, etc. b. Fraunhofer diffraction: Diffraction pattern in which, the source of light and the screen are effectively at infinite distances from the diffracting system is called Fraunhoffer diffraction. In this diffraction pattern convex lens is used. eg: Diffraction due to single slit, double slit, etc.

Answer»

The bending of light near the edge of an obstacle or slit and spreading into the region of geometrical shadow is called diffraction of light.

Two types of diffraction are:

a. Fresnel diffraction: Diffraction pattern in which source of light and screen are kept at finite distance from the slit is called fresnel diffraction.

eg: Diffraction of straight edge, small opaque disc, narrow rectangular slit, etc.

b. Fraunhofer diffraction: Diffraction pattern in which, the source of light and the screen are effectively at infinite distances from the diffracting system is called Fraunhoffer diffraction. In this diffraction pattern convex lens is used.

eg: Diffraction due to single slit, double slit, etc.

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