Physics Quiz: Trivia Questions On Wave Optics!

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Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.
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    A Polaroid produces a strong beam of light which is:

    • Circularly polarised
    • Elliptically polarised
    • Plane polarised
    • Unpolarised
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About This Quiz


Delve into the fascinating world of wave optics with our 'Reflection in Wave Optics Quiz.' This quiz is designed to test your understanding of the principles behind reflection phenomena in wave optics. Explore the intricate interactions of light waves with surfaces and interfaces as you tackle questions that cover topics such as the laws of reflection, reflection coefficients, and the behavior of light waves at different angles of incidence. Challenge yourself with scenarios that simulate real-world applications of reflection, from understanding how mirrors produce images to analyzing the behavior of light waves in optical devices like lenses and prisms. Wade, through the principles of reflection in wave optics, see how well you can navigate the complexities of this intriguing subject. Test your expertise with our 'Reflection in Wave Optics Quiz' today!

Physics Quiz: Trivia Questions On Wave Optics! - Quiz

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  • 2. 

    The fringe width β of a diffraction pattern and the slit width d are related as:

    Correct Answer
    A.
    Explanation
    The fringe width β of a diffraction pattern is directly proportional to the slit width d. This means that as the slit width increases, the fringe width also increases. This relationship can be understood by considering that a wider slit allows more light to pass through, resulting in a larger diffraction pattern with wider fringes. Conversely, a narrower slit restricts the amount of light passing through, leading to a smaller diffraction pattern with narrower fringes. Therefore, the fringe width and slit width are related, with the fringe width increasing as the slit width increases.

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  • 3. 

    For sustained interference, we need two sources which emit radiations:

    • Of the same intensity

    • Of the same amplitude

    • Having a constant phase difference

    • None of these

    Correct Answer
    A. Having a constant phase difference
    Explanation
    In order to observe sustained interference, it is necessary for two sources to emit radiations with a constant phase difference. This means that the two sources are emitting waves that are in sync with each other, with a consistent phase relationship. If the phase difference between the waves is not constant, the interference pattern will not be sustained and will fluctuate over time. Therefore, it is crucial for the phase difference to remain constant for sustained interference to occur.

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  • 4. 

    A phase difference of 5π corresponds to a path difference (in terms λ) of:

    • 5λ

    • 10λ

    • 5λ/2

    • 2λ

    Correct Answer
    A. 5λ/2
    Explanation
    A phase difference of 5π corresponds to a path difference (in terms of λ) of 5λ/2. This can be explained by understanding the relationship between phase difference and path difference in wave interference. In wave interference, the phase difference between two waves is directly related to the path difference between them. When the phase difference is 2π, the path difference is equal to one wavelength (λ). Therefore, when the phase difference is 5π, the path difference would be 5/2 times the wavelength (5λ/2).

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  • 5. 

    The angle between the pass axis of the polarizer and analyzer is 45 degrees. The percentage of polarised light passing through the analyzer is:

    • 100%

    • 50%

    • 25%

    • 75%

    Correct Answer
    A. 50%
    Explanation
    When the angle between the pass axis of the polarizer and analyzer is 45 degrees, the intensity of the polarized light passing through the analyzer is reduced by half. This is because the analyzer only allows light that is polarized in the same direction as its pass axis to pass through, while blocking light polarized perpendicular to its pass axis. Therefore, only 50% of the polarized light will pass through the analyzer.

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  • 6. 

    The initial shape of the wavefront of the beam is:

    • Concave

    • Convex near the axis and concave near the periphery

    • Planar

    • Convex

    Correct Answer
    A. Planar
    Explanation
    The initial shape of the wavefront of the beam is planar, meaning that it is flat and does not curve in any direction. This suggests that the beam is propagating in a straight line without any distortion or curvature in its wavefront.

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  • 7. 

    Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2, at a point A and π at a point B. The difference between the resultant intensities at A and B is:

    • 2I

    • 4I

    • 5I

    • 7I

    Correct Answer
    A. 4I
  • 8. 

    What happens if one of the slits, say S1, in Young’s double slit experiment is covered with a glass plate which absorbs half the intensity of light from it?

    • The bright fringes become less bright and dark fringes have a finite light intensity

    • The bright fringes become brighter and dark fringes become darker

    • The fringe width decreases

    • No fringes will be observed

    Correct Answer
    A. The bright fringes become less bright and dark fringes have a finite light intensity
    Explanation
    When one of the slits, S1, is covered with a glass plate that absorbs half the intensity of light from it, the overall intensity of light reaching the screen decreases. This causes the bright fringes to become less bright as there is less light contributing to their intensity. Additionally, the dark fringes have a finite light intensity because even though some light is being absorbed by the glass plate, there is still some light passing through the other slit, S2, and reaching the dark regions. Therefore, the bright fringes become less bright and the dark fringes have a finite light intensity.

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  • 9. 

    Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:

    Correct Answer
    A.
    Explanation
    The sum of the maximum and minimum intensities of the two periodic waves is equal to the sum of their individual maximum and minimum intensities. This is because the waves are passing through the region at the same time and in the same direction, so their intensities add up. Therefore, the sum of the maximum and minimum intensities is I1(max) + I2(max) + I1(min) + I2(min).

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  • 10. 

    Two coherent sources of intensity ratio β interfere. Then the value of

    Correct Answer
    A.
  • 11. 

    Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are:

    • 5I and I

    • 9I and I

    • 5I and 3I

    • 9I and 3I

    Correct Answer
    A. 9I and I
    Explanation
    When two coherent monochromatic light beams are superposed, the resulting intensity can be calculated using the principle of superposition. The principle states that the intensities of the two beams add up algebraically. In this case, the intensities are I and 4I. Adding these together gives a maximum intensity of 5I (when the two beams are in phase) and a minimum intensity of I (when the two beams are completely out of phase). Therefore, the correct answer is 5I and I.

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  • 12. 

    n identical waves each of intensity Io interfere each other. The ratio of maximum intensities if interference is coherent and incoherent is:

    • N

    • N2

    • N3

    • 1/n2

    Correct Answer
    A. N
    Explanation
    When n identical waves interfere coherently, the maximum intensity is obtained when all the waves are in phase and add up constructively. In this case, the intensity is directly proportional to the number of waves, so the ratio of maximum intensities would be n.

    On the other hand, when the interference is incoherent, the waves do not maintain a constant phase relationship. As a result, the waves do not add up perfectly and the maximum intensity is less than the coherent case. However, the ratio of maximum intensities still depends on the number of waves, so the answer remains n.

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  • 13. 

    In a double-slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite of one of the slits, find its order:

    Correct Answer
    A.
    Explanation
    The order of the bright fringe can be determined using the equation mλ = d sinθ, where m is the order of the fringe, λ is the wavelength of light, d is the distance between the slits, and θ is the angle between the line joining the slit and the line joining the slit and the bright fringe. Since the bright fringe is formed opposite one of the slits, the angle θ is 0°. Therefore, sinθ is also 0, and the equation becomes mλ = 0. This implies that the order of the bright fringe is 0.

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  • 14. 

    A beam is used in Young’s double-slit experiment. The slit width is d. When the velocity of the electron is increased, then

    • No interference in observed

    • Fringe width increases

    • Fringe width decreases

    • Fringe width remains same

    Correct Answer
    A. Fringe width decreases
    Explanation
    When the velocity of the electron is increased in Young's double slit experiment, the fringe width decreases. This is because the fringe width is inversely proportional to the velocity of the particle. As the velocity increases, the distance traveled by the electron in a given time interval also increases. This results in a shorter wavelength and a smaller fringe width. Therefore, the correct answer is "Fringe width decreases."

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  • 15. 

    Two coherent monochromatic light sources are located at two vertices of an equilateral triangle. If the intensity due to each of the sources independently is 1Wm-2 at the third vertex, the resultant intensity due to both the sources at that point (i.e., at the third vertex) is:

    • Zero

    • Physics Quiz: Trivia Questions On Wave Optics! - Quiz

    • 2

    • 4

    Correct Answer
    A. 4
    Explanation
    When two coherent monochromatic light sources are located at two vertices of an equilateral triangle, the resultant intensity at the third vertex is given by the principle of superposition. According to this principle, the intensities of the two sources add up. Since the intensity due to each source is 1Wm-2, the total intensity at the third vertex will be 2Wm-2. Therefore, the correct answer is 2.

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Matt Balanda |BS (Aerospace Engineering) |
Science Teacher
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

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  • May 08, 2024
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