Diffraction of Light questions with solutions

Showing 1–10 of 41 questions

• NumericdifficultWave OpticsDiffraction of Light

  In a single slit diffraction experiment, a slit of width (0.016 ± 0.002) mm is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular distance between the central maximum and first minimum is measured to be (2° ± 40′). The value of the fractional error in the measurement of wavelength is: [Given: sin(2°) = 0.035]

  Your answer

  Check answerShow answer

  JEE Advanced2026Paper 2

  Open question & full solution →
• MCQmediumWave OpticsDiffraction of Light

  A single slit of width a is illuminated with monochromatic light of wavelength 600 nm. The first minimum occurs at θ = 30°. The slit width a is:

  Options

  • Option A

    0.6 μm

  • Option B

    3 μm

  • Option C

    1.8 μm

  • Option D

    1.2 μm

  Check answerShow answer

  15 April 2023 Morning Shift

  Open question & full solution →
• MCQeasyWave OpticsDiffraction of Light

  A telescope with an objective of diameter R is used to observe a distant star emitting light of wavelength 500 nm. The required angular resolution is 5×10⁻⁷ rad. Using the Rayleigh criterion θ = 1.22λ /R, what is R in centimetres?

  Options

  • Option A

    61 cm

  • Option B

    122 cm

  • Option C

    244 cm

  • Option D

    305 cm

  Check answerShow answer

  JEE Mains 2026 4 April Morning Shift

  Open question & full solution →
• NumericmediumWave OpticsDiffraction of Light

  Light of wavelength 500 nm falls normally on a single slit of width 0.20 mm. A screen is placed 2 m from the slit and extends from -22 mm to +22 mm relative to the centre of the pattern. How many diffraction minima are visible on the screen?

  Your answer

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQeasyWave OpticsDiffraction of Light

  The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on the focal plane of a convex lens of focal length 100 cm. The width of the 1st secondary maxima will be :

  Options

  • Option A

    2 mm

  • Option B

    2 cm

  • Option C

    0.02 mm

  • Option D

    0.2 mm

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• A/RmediumWave OpticsDiffraction of Light

  Choose the correct option for the following Assertion (A) and Reason (R).

  Assertion

  The central maximum in a single-slit diffraction pattern is approximately twice as wide as each secondary maximum.

  Reason

  The first minima surrounding the central maximum occur at a sinθ = ±λ, while consecutive minima on the same side are approximately separated by λD ÷ a on a distant screen.

  Options

  • Option A

    Both A and R are true and R is the correct explanation of A.

  • Option B

    Both A and R are true but R is NOT the correct explanation of A.

  • Option C

    A is true but R is false.

  • Option D

    A is false but R is true.

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• NumericeasyWave OpticsDiffraction of Light

  Monochromatic light of wavelength 600 nm falls normally on a single slit of width 0.20 mm. The diffraction pattern is observed on a screen 2 m away. Find the width of the central maximum in millimetres.

  Your answer

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQmediumWave OpticsDiffraction of Light

  In a single-slit Fraunhofer diffraction experiment, the slit width is reduced to half while the incident wave amplitude per unit slit width remains unchanged. Which statement correctly describes the new central diffraction pattern?

  Options

  • Option A

    The central width becomes half and peak intensity doubles

  • Option B

    The central width doubles and peak intensity becomes one-fourth

  • Option C

    The central width doubles and peak intensity remains unchanged

  • Option D

    The central width remains unchanged and peak intensity becomes half

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQmediumWave OpticsDiffraction of Light

  The central maximum of a single-slit diffraction pattern has width 8 mm. The screen distance is increased by 25%, and the slit width is simultaneously decreased by 20%. The wavelength remains unchanged. What is the new central maximum width?

  Options

  • Option A

    8.0 mm

  • Option B

    10.0 mm

  • Option C

    12.5 mm

  • Option D

    15.0 mm

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• NumericmediumWave OpticsDiffraction of Light

  A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm width. Angular divergence corresponding to second order minima would be _____ × 10⁻³ rad.

  Your answer

  Check answerShow answer

  JEE Mains 2024 08 Apr Morning Shift

  Open question & full solution →