Concept explainers
Coherent light of wavelength 501.5 nm is sent through two parallel slits in an opaque material. Each slit is 0.700 μm wide. Their centers are 2.80 μm apart. The light then falls on a semicylindrical screen, with its axis at the midline between the slits. We would like to describe the appearance of the pattern of light visible on the screen. (a) Find the direction for each two-slit interference maximum on the screen as an angle away from the bisector of the line joining the slits. (b) How many angles are there that represent two-slit interference maxima? (c) Find the direction for each single-slit interference minimum on the screen as an angle away from the bisector of the line joining the slits. (d) How many angles are there that represent single-slit interference minima? (e) How many of the angles in part (d) are identical to those in part (a)? (f) How many bright fringes are visible on the screen? (g) If the intensity of the central fringe is Imax, what is the intensity of the last fringe visible on the screen?
(a)
The direction for the each two slit interference as an angle away from the bisector of the line joining the centre of the slits.
Answer to Problem 12P
The possible direction of two slit interference maxima are
Explanation of Solution
Given information: The wavelength of light is
The condition for double slit interference maxima is,
Here
Further solve equation (1) as;
Substitute
For different value of
For
Substitute
Thus for
For
Substitute
Thus for
For
Substitute
Thus for
For
Substitute
Thus for
For
Substitute
Thus for
For
Substitute
Thus for
For
Substitute
The value of
Conclusion:
Therefore, there are
(b)
The numbers of angles that represents two slit interference maxima.
Answer to Problem 12P
There are
Explanation of Solution
The calculation in part (a) shows that for zero order there is one angle and for first, second, third, fourth and fifth order there are each two direction for a single that represent the two slit interference maxima
The possible angles are
Conclusion:
Therefore, there are
(c)
The direction of each single-slit interference minimum on the screen as an angle away from the bisector of the line joining the slits.
Answer to Problem 12P
The direction of each single-slit interference minimum on the screen as an angle away from the bisector of the line joining the slits is.
Explanation of Solution
Given Info: The condition for the interference minima in single slit interference minima is,
Here,
Substitute
For different value of
For
Substitute
Thus for
For
Substitute
The value of
Thus up to second order the single slit interference is possible.
Conclusion:
Therefore, the possible directions are
(d)
The numbers of angles that represents single slit interference maxima.
Answer to Problem 12P
There are
Explanation of Solution
The calculation in part (c) shows that for first order only the single slit interference minima is possible.
The possible angles are
So there are total
Conclusion:
Therefore, there are
(e)
The numbers of angles that are identical for single interference minima and double slit interference maxima.
Answer to Problem 12P
There are
Explanation of Solution
The calculation in part (a) and part (c) shows that the angles
So there are total
Conclusion:
Therefore, there are
(f)
The number of bright fringes visible on the screen.
Answer to Problem 12P
There are
Explanation of Solution
The calculation in part (a) and part (c) shows that the angles
So, for the position at
Thus there are
So, there are
Conclusion:
Therefore, there are
(g)
The intensity of the last fringe on the screen in terms of maximum intensity.
Answer to Problem 12P
The intensity of the last fringe is
Explanation of Solution
The formula to calculate the intensity at any angle is,
Here,
The last fringe occurs for the fifth order so the value of
Substitute
Conclusion:
Therefore, the intensity at the last fringe is
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Chapter 38 Solutions
Physics For Scientists And Engineers With Modern Physics, 9th Edition, The Ohio State University
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