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Explain Young's double slit-experiment. |
Answer» Solution :Young.s DOUBLE slit apparatus consists of a narrow rectangular slit S. It is illuminated by a monochromatic light. The light emerging from S illuminates the two identical close SLITS `S_1` and `S_2` whichacts as coherent SOURCES . The wave emerging from `S_1` and `S_2`get superposed and interference fringes are produced as SHOWN on the observation screen. Bright fringes are formed on the screen due to the superpositionof crests of two waves or troughs of two waves. Dark friges are formed due to the superposition of crest and trough of two waves. At the CENTRE of the screen always bright fringe is formed. This is because , all the waves meeting at the centre of the screen have the zero path difference and zero phase difference. 
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