NEET Physics: Wave Optics — MCQ Test 21

Q6. What is the refractive index of a medium if the critical angle for light passing into air is \( 39^\circ \)?

Q7. In a double-slit experiment, if \( \lambda = 400 \, \text{nm} \), \( d = 0.4 \, \text{mm} \), and \( D = 2.0 \, \text{m} \), what is the distance of the third bright fringe from the central maximum?

Q8. What is the condition for the third secondary maximum in a single-slit diffraction pattern?

Q9. What is the wavelength of light in a medium with refractive index 1.5 if its wavelength in vacuum is \( 750 \, \text{nm} \)?

Q10. What is the critical angle for light passing from a medium with refractive index 1.85 to air (refractive index 1.0)?

NEET Physics — Wave Optics

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What is the distance of the third dark fringe from the central maximum in a double-slit experiment if \( \lambda = 600 \, \text{nm} \), \( d = 0.4 \, \text{mm} \), and \( D = 2.0 \, \text{m} \)?

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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 Distance, Experiment, Wavefront, Produced, Reflection, and Reflected.

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. What is the distance of the third dark fringe from the central maximum in a double-slit experiment if \( \lambda = 600 \, \text{nm} \), \( d = 0.4 \, \text{mm} \), and \( D = 2.0 \, \text{m} \)?

  • A. 6.0 mm
  • B. 9.0 mm
  • C. 7.5 mm
  • D. 4.5 mm

Q2. What is the nature of the wavefront produced by a plane wave after reflection from a concave mirror?

  • A. Plane
  • B. Cylindrical
  • C. Tilted
  • D. Spherical

Q3. What is the shape of the wavefront reflected by a plane mirror when a spherical wave is incident on it?

  • A. Spherical
  • B. Plane
  • C. Cylindrical
  • D. Tilted plane

Q4. What is the path difference for the third dark fringe in a double-slit experiment?

  • A. \( 2\lambda \)
  • B. \( \frac{5\lambda}{2} \)
  • C. \( \frac{3\lambda}{2} \)
  • D. \( 3\lambda \)

Q5. What is the refractive index of a medium if the speed of light in it is \( 1.8 \times 10^8 \, \text{m/s} \) and in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?

  • A. 1.5
  • B. 1.33
  • C. 1.67
  • D. 1.8

+ 5 more questions in the actual test

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