# Model answer Quiz2 – بصريات فيزيائية 312PHYS-4 31 01..

```5/15/2020
Test Statistics: Quiz2 – 312_‫ﺑﺻرﯾﺎت ﻓﯾزﯾﺎﺋﯾﺔ‬PHYS-4_31_01...
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Test Statistics: Quiz2
Test Statistics: Quiz2
The statistics are calculated based only on the attempts being used in the grading option (Last
attempt, First attempt, Lowest Score, Highest Score, or Average of Scores). If Average of Scores
is the grading option, then all attempts are included in the statistics.
Name
Quiz2
Attempt Score
4.40909
Attempts
11 (Total of 21 attempts for this assessment)
11
Attempts that Need Grading 0
Instructions
Alignments
Question 1: Multiple Choice
Average Score 0.36363 points
The criterion for far- eld di raction is such that the distance from the
slit to the screen is given by
Correct
L &lt;&lt; (area of aperture)/λ
9.09%
L&gt;&gt; (area of aperture)/λ
72.727%
L= (area of aperture)/λ
18.181%
L &gt;&gt;λ /(area of aperture)
0.00%
0.00%
https://lms.jazanu.edu.sa/webapps/assessment/stats/stats.jsp?outcome_definition_id=198564&amp;course_id=_69117_1
1/5
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Test Statistics: Quiz2 – 312_‫ﺑﺻرﯾﺎت ﻓﯾزﯾﺎﺋﯾﺔ‬PHYS-4_31_01...
Question 2: Multiple Choice
Average Score 0.45454 points
Consider a parallel beam of 546 nm of width b = 0.5 mm propagating
across the room, a distance of 10 m. what is the nal width of the
beam due to di raction spreading?
Correct
22 mm
90.909%
44 mm
0.00%
66 mm
0.00%
88 mm
0.00%
9.09%
Question 3: Multiple Choice
Average Score 0.5 points
If there are N number of slits in a grating spectra, then how many
secondary maximas are there?
Correct
N
0.00%
N–1
0.00%
N–2
100.00%
2N
0.00%
0.00%
Question 4: Multiple Choice
Average Score 0.45454 points
Assuming we fully illuminate the grating from the previous problem (a
= 2500nm), how many orders can be seen when resolve the Na lines
(589 nm, 589.6 nm)?
Correct
2
9.09%
3
0.00%
4
90.909%
https://lms.jazanu.edu.sa/webapps/assessment/stats/stats.jsp?outcome_definition_id=198564&amp;course_id=_69117_1
2/5
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Test Statistics: Quiz2 – 312_‫ﺑﺻرﯾﺎت ﻓﯾزﯾﺎﺋﯾﺔ‬PHYS-4_31_01...
5
0.00%
0.00%
Question 5: Multiple Choice
Average Score 0.45454 points
What is the Rayleigh's criterion for just-resolvable images?
Correct
The primary maximum of the rst
coincides with the primary maximum of
the second
0.00%
The primary maximum of the rst
coincides with the 1st secondary
maximum of the second
0.00%
The primary maximum of the rst
coincides with the 1st minimum of the
second
90.909%
The primary maximum of the rst
coincides with the 2nd minimum of the
second
0.00%
9.09%
Question 6: Multiple Choice
Average Score 0.40909 points
The two headlights of an approaching automobile are 1.5 m apart.
Assume the pupil diameter is 4.3 mm and the wavelength of light is
540 nm. What is the the limit of resolution
Correct
0.00%
0.00%
81.818%
9.09%
9.09%
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Test Statistics: Quiz2 – 312_‫ﺑﺻرﯾﺎت ﻓﯾزﯾﺎﺋﯾﺔ‬PHYS-4_31_01...
Question 7: Multiple Choice
Average Score 0.36363 points
A di raction grating has 4000 lines/cm. What is the dispersive power of
the grating in the third order spectrum in the wavelength region of 500
nm ?
Correct
5000
0.00%
10000
0.00%
15000
72.727%
20000
18.181%
9.09%
Question 8: Multiple Choice
Average Score 0.5 points
For single slit Di raction, what is the path di erence between the two
ends of the slit?
Correct
Δ = b sin θ
100.00%
Δ = b cos θ
0.00%
Δ = cos θ
0.00%
Δ=0
0.00%
0.00%
Question 9: Multiple Choice
Average Score 0.40909 points
The shortest wavelength of light present in a given source is 600 nm.
What is the free spectral range in the 2nd order of grating di raction?
Correct
150 nm
0.00%
300 nm
81.818%
600 nm
0.00%
1200 nm
9.09%
9.09%
https://lms.jazanu.edu.sa/webapps/assessment/stats/stats.jsp?outcome_definition_id=198564&amp;course_id=_69117_1
4/5
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Test Statistics: Quiz2 – 312_‫ﺑﺻرﯾﺎت ﻓﯾزﯾﺎﺋﯾﺔ‬PHYS-4_31_01...
Question 10: Multiple Choice
Average Score 0.5 points
Resolving power of grating is terms of number of slits N and di raction
order m is given by
Correct
m/N
0.00%
N/m
0.00%
N
0.00%
mN
100.00%