
(a)
The position of first bright fringe appears on either side of the central fringe.
(a)

Answer to Problem 2SP
The position of first bright fringe is
Explanation of Solution
Given info:
Write an expression for condition of maxima.
Here,
Substitute
Thus, the position of first bright fringe is
Conclusion:
Thus, position of first bright fringe is
(b)
The position of second bright fringe on either side of the central fringe.
(b)

Answer to Problem 2SP
The position of second bright fringe is
Explanation of Solution
Given info: Wavelength of the light is
Write an expression for condition of maxima.
Here,
Substitute
Thus, the position of second bright fringe is
Conclusion:
The position of second bright fringe is
(c)
The position of first dark bright fringe appeared on either side of the central fringe.
(c)

Answer to Problem 2SP
The position of first dark fringe is
Explanation of Solution
Given info: Wavelength of the light is
Write an expression for condition of minima.
Here,
Substitute
Thus, the position of first dark fringe is
Conclusion:
Thus, position of first dark fringe is
(d)
Sketch the diffraction pattern showing the position of the seven central fringes and mark the position of the fringes.
(d)

Answer to Problem 2SP
The diffraction pattern is given in figure 1.
Explanation of Solution
Write an expression for condition of minima.
Here,
Substitute
Thus, the position of second dark fringe is
Write an expression for condition of maxima.
Here,
Substitute
Thus, the position of third bright fringe is
Following figure gives the diffraction pattern.
Figure 1
Here, the first, second and third order bright fringes will appear at distance of
Conclusion:
The diffraction pattern is given in figure 1.
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Chapter 16 Solutions
EBK PHYSICS OF EVERYDAY PHENOMENA
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