| Figure shows two, identical narrow slits \[{{S}_{1}}\] and \[{{S}_{2}}\]. A very small completely absorbing strip is placed at distance 'y' from the point C. 'C' is the point on the screen equidistant from \[{{S}_{1}}\] and \[{{S}_{2}}\]. Assume \[\lambda <<d<<D,\] where \[\lambda ,\,d\] and D have usual meaning. When \[{{S}_{2}}\] is covered the force due to light acting on strip is 'f and when both slits are opened the force acting on strip is 2f. The minimum positive 'y' \[(<<D)\] coordinate is \[\frac{\lambda D}{xd}\]. Find the value of x. |
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Answer:
4
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