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A long narrow horizontal slit is placed ...

A long narrow horizontal slit is placed 1 mm above a horizontal plane mirror. The interference between the light coming directly from the slit and that after reflection is seen on a screen 1.0 in away from the slit, Find the fringe-width if the light used has a wavelength of 700 nm.

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The correct Answer is:
C
Givent that `D=1m`
`lamda=700mm=700xx10^-3m
Since `a=1mm`
`d=2a=2mm`
`=2xx10^-3m`
[L loyd's mirror experiment]`
Fringe width =(lamdaD)/d`
`=(700xx10^9xx1m)/(2xx0^-3m)`
`0.35mm`
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HC VERMA-LIGHT WAVES-Exercises
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  2. A narrow slit S transmitting light of wavelength lamda is placed a dis...

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  14. Consider the situation shown in figure. The two slits S1 and S2 placed...

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