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If fringes width  cm is 0.431 mm and shift of white central fringe on introducing a mica sheet in one path is 1.89 mm.  Thickness of the mica sheet will be

a)

b)

c)

d)

None of these


Question ID - 150180 | Top Ranker Answer | SaraNextGen

If fringes width  cm is 0.431 mm and shift of white central fringe on introducing a mica sheet in one path is 1.89 mm.  Thickness of the mica sheet will be

a)

b)

c)

d)

None of these

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

When a mica sheet is introduced in the path of one of the two interfering beams, then entire fringe pattern is displaced towards the beam is the path of which plate is introduce, but fringe width is not changed.

Also fringe width is

Also fringe width is

Using Eq. (ii) we get Eq. (i) as

Given,



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