1.

In double slit experiment, the angular width of the fringes is 0.20^(@) for the sodium light (lambda = 5890 Å). In order to increase the angular width of the fringe by 10%, the necessary change in the wavelength is :

Answer»

increase of `589 Å`
decrease of `589 Å`
increase of `6479 Å`
zero

Solution :Angular FRINGE width `w_(0) = (lambda)/(d)`
`Deltaw_(0) = (Delta lambda)/(d)`
`(Deltalambda)/(lambda) = (Deltaw_(0))/(w_(0)) = (10)/(100) = 0.1`
`RIGHTARROW Delta lambda = 0.1 lambda = 0.1 xx 5890 Å`
= 589 Å(increase).


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