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
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 | SaraNextGen Top Answer
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
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If fringes width |
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a) |
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b) |
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c) |
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d) |
None of these |
1 Answer
127 votes
Answer Key / Explanation : (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.
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Also fringe width is
Also fringe width is
Using Eq. (ii) we get Eq. (i) as
Given, 
127 votes
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127