Distance between given bright and dark fringes from the fringe width

1. A.
   1.5 X
2. B.
   2 X
3. C.
   5.5 X
4. D.
   9.5 X

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1. A.
   $5440\,\text{\AA}$
2. B.
   $5890\,\text{\AA}$
3. C.
   $5900\,\text{\AA}$
4. D.
   $6630\,\text{\AA}$

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1. A.
   6 mm
2. B.
   4 mm
3. C.
   1.5 mm
4. D.
   0.9 mm

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1. A.
   13 mm
2. B.
   17 mm
3. C.
   19 mm
4. D.
   23 mm

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1. A.
   $n:m$
2. B.
   $m:n$
3. C.
   $n:\left( m - \frac{1}{2} \right)$
4. D.
   $\ \left( n - \frac{1}{2} \right):m$

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1. A.
   $0.5$ mm
2. B.
   $0.75$ mm
3. C.
   $1.0$ mm
4. D.
   $1.5$ mm

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1. A.
   $1$
2. B.
   $2$
3. C.
   $3$
4. D.
   $4$

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