Question

WHAT IS KNOWN AS DIFFRACTION OF LIGHT ?

Answer 1

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A prism is a piece of a transparent material bounded by two plane surfaces inclined at an angle. We generally use prisms having triangular faces. 

In the year 1686, Sir Isaac Newton did his well-known experiments on passage of white light through a glass prism. He made a narrow pencil of ( white ) light fall on a glass prism. The emergent light was received on a white paper/white screen. It was observed ( on some adjustment of the prism ) that there were seven colours appear on the screen - VIOLET, INDIGO, BLUE, GREEN, YELLOW, ORANGE & RED ( VIBGYOR ) - The colours that we see in a rainbow. A prism, unlike a parallel faced rectangular glass block, was not only deviating or bending, an incident ray towards its base but also splitting white light into seven colours. We call this phenomenon - Spitting of white light into several colours, as the phenomenon of DISPERSION OF LIGHT. 


In simple words, The splitting of white light into its component ( seven ) colours is referred to as the phenomenon of the DISPERSION OF LIGHT. 


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Answer 2

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If an opaque object on the path of light becomes very small, light has a tendency to bend around it and not walk in a straight line. This effect is known as diffraction of light.

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