NEET Physics: Wave Optics — MCQ Test 11

Q6. What is the condition for the central maximum in a single-slit diffraction pattern?

Q7. What is the distance of the third dark fringe from the central maximum in a double-slit experiment if \( \lambda = 550 \, \text{nm} \), \( d = 0.25 \, \text{mm} \), and \( D = 2.0 \, \text{m} \)?

Q8. What causes the secondary maxima in a single-slit diffraction pattern to be weaker than the central maximum?

Q9. What is the fringe width in a double-slit experiment if \( \lambda = 620 \, \text{nm} \), \( d = 0.5 \, \text{mm} \), and \( D = 2.0 \, \text{m} \)?

Q10. What is the speed of light in a medium with a refractive index of 1.5, given the speed of light in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?

NEET Physics — Wave Optics

Free MCQ Test 11 of 22

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Why can’t two ordinary light sources, like sodium lamps, produce a stable interference pattern when illuminating two slits?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Wave Optics. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Ordinary, Interference, Illuminating, Diffraction, Wavelength, and Refractive.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. Why can’t two ordinary light sources, like sodium lamps, produce a stable interference pattern when illuminating two slits?

  • A. They emit different wavelengths
  • B. They are incoherent due to random phase changes
  • C. Their amplitudes are unequal
  • D. They produce longitudinal waves

Q2. What is the angular width of the central maximum in a single-slit diffraction pattern if the slit width is \( 12.0 \, \mu\text{m} \) and the wavelength is \( 480 \, \text{nm} \)?

  • A. 9.2°
  • B. 2.9°
  • C. 4.6°
  • D. 13.9°

Q3. What is the speed of light in a medium with refractive index 1.45, given the speed in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?

  • A. \( 2.07 \times 10^8 \, \text{m/s} \)
  • B. \( 2.14 \times 10^8 \, \text{m/s} \)
  • C. \( 1.5 \times 10^8 \, \text{m/s} \)
  • D. \( 3.0 \times 10^8 \, \text{m/s} \)

Q4. In a diffraction experiment, if the slit width is \( 4.0 \, \mu\text{m} \) and the wavelength is \( 800 \, \text{nm} \), what is the angular position of the first minimum?

  • A. \( 10^\circ \)
  • B. \( 15^\circ \)
  • C. \( 11.5^\circ \)
  • D. \( 20^\circ \)

Q5. What explains the presence of alternate bright and dark bands near the edge of a shadow in diffraction?

  • A. Amplitude variation
  • B. Frequency change
  • C. Speed increase
  • D. Interference of bent light

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