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Show that lateral shift is equal to the ...

Show that lateral shift is equal to the thickness of the slab for grazing incidence.

Text Solution

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`i=90^(@)`
`r=C=` critical angle
`therefore " Lateral shift"=(t sin(90^(@)-C))/(cosC)`
`L.S=(t cosC)/(cosC): L.S=t`
`therefore` For grazing incidence, there will be grazing emergence. So L.S = t.
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Knowledge Check

  • When one of the slits of young's experiment is convered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe?

    A
    1.6 mm
    B
    3.8 mm
    C
    3.2 mm
    D
    7.6 mm

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