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Single-slit diffraction: position of minima and width of the central maximum

This type of question, asked 10 times: 15 Apr 2023, 27 Jan 2024, 29 Jan 2024, 30 Jan 2024, 1 Feb 2024, 5 Apr 2024, 8 Apr 2024, 2 Apr 2025, 2 Apr 2026 S1, 4 Apr 2026 S1. All 11 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    15 Apr 2023

    19
    A single slit of width aa is illuminated by a monochromatic light of wavelength 600 nm600\text{ }nm. The value of ' aa ' for which first minimum appears at θ=30∘\theta =30^{\circ} on the screen will be:

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  2. Question 2

    27 Jan 2024

    117
    A parallel beam of monochromatic light of wavelength 5000Å5000\text{Å} is incident normally on a single narrow slit of width 0.001 mm. The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of _____(degree).

  3. Question 3

    29 Jan 2024

    117
    In a single slit diffraction pattern, a light of wavelength 6000Å6000\text{Å} is used. The distance between the first and third minima in the diffraction pattern is found to be 3 mm3\text{ }mm when the screen is placed 50 cmcm away from slits. The width of the slit is _____ ×10−4 m\times10^{- 4}\text{ }m.

  4. Question 4

    30 Jan 2024

    10
    The diffraction pattern of a light of wavelength 400 nmnm diffracting from a slit of width 0.2 mm0.2\text{ }mm is focused on the focal plane of a convex lens of focal length 100 cm100\text{ }cm. The width of the 1st 1^{\text{st~}} secondary maxima will be:

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  5. Question 5

    1 Feb 2024

    101
    A microwave of wavelength 2.0 cm2.0\text{ }cm falls normally on a slit of width 4.0 cm4.0\text{ }cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5 m1.5\text{ }m away from the slit, will be:

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  6. Question 6

    1 Feb 2024

    20
    A monochromatic light of wavelength 6000Å6000\text{Å} is incident on the single slit of width 0.01 mm0.01\text{ }mm. If the diffraction pattern is formed at the focus of the convex lens of focal length 20 cm20\text{ }cm, the linear width of the central maximum is:

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  7. Question 7

    5 Apr 2024

    113
    In a single slit experiment, a parallel beam of green light of wavelength 550 nm550\text{ }nm passes through a slit of width 0.20 mm0.20\text{ }mm. The transmitted light is collected on a screen 100 cm100\text{ }cm away. The distance of first order minima from the central maximum will be x×10−5 mx \times10^{- 5}\text{ }m. The value of xx is:

  8. Question 8

    8 Apr 2024

    29
    A parallel beam of monochromatic light of wavelength 600 nm600\text{ }nm passes through single slit of 0.4 mm0.4\text{ }mm width. Angular divergence corresponding to second order minima would be _____ ×10−3rad\times10^{- 3}rad.

  9. Question 9

    2 Apr 2025

    23
    If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is 30∘30^{\circ} in a single slit diffraction pattern recorded using 628 nm light, then the width of the slit is ____\_\_\_\_ μm\mu m.

  10. Question 10

    2 Apr 2026 S1

    21
    In single slit diffraction pattern, the wavelength of light used is 628 nm and slit width is 0.2 mm , the angular width of central maximum is α×10−2\alpha \times 10^{- 2} degrees. The value of α\alpha is ____\_\_\_\_ .

  11. Question 11

    4 Apr 2026 S1

    8
    A slit of width a is illuminated by light of wavelength λ\lambda. The linear separation between 1st 1^{\text{st~}} and 3rd 3^{\text{rd~}} minima in the diffraction pattern produced on a screen placed at a distance D from the slit system is ____\_\_\_\_ .

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