NEET Physics: Wave Optics — MCQ Test 20

Q6. What is the path difference for the fifth dark fringe in a double-slit experiment?

Q7. What does the wave theory predict about the speed of light when it bends towards the normal during refraction?

Q8. What allows light to propagate through a vacuum without requiring a traditional medium?

Q9. What is the distance of the fourth bright fringe from the central maximum in a double-slit experiment if \( \lambda = 560 \, \text{nm} \), \( d = 0.35 \, \text{mm} \), and \( D = 1.4 \, \text{m} \)?

Q10. What is the angle of refraction when light is incident at the critical angle from a denser medium to a rarer medium?

NEET Physics — Wave Optics

Free MCQ Test 20 of 22

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Medium

What is the intensity of light after passing through two polaroids with pass-axes at \( 45^\circ \), if the initial unpolarized intensity is \( I_0 \)?

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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 Intensity, Polaroids, Unpolarized, Experiment, Wavelengths, and Smallest.

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 intensity of light after passing through two polaroids with pass-axes at \( 45^\circ \), if the initial unpolarized intensity is \( I_0 \)?

  • A. \( \frac{I_0}{2} \)
  • B. \( \frac{I_0}{4} \)
  • C. \( I_0 \)
  • D. \( 0 \)

Q2. In a double-slit experiment, if two wavelengths \( 600 \, \text{nm} \) and \( 400 \, \text{nm} \) are used, what is the smallest distance from the central maximum where their bright fringes coincide? (\( d = 0.2 \, \text{mm} \), \( D = 1.0 \, \text{m} \))

  • A. 3.0 mm
  • B. 4.0 mm
  • C. 5.0 mm
  • D. 6.0 mm

Q3. Why does the interference pattern from two slits disappear if the slits are too far apart?

  • A. Amplitude doubles
  • B. Frequency decreases
  • C. Reduced wavefront overlap
  • D. Wavelength increases

Q4. What is the speed of light in a medium if its refractive index is 1.2 and the speed in vacuum is \( 3.0 \times 10^8 \, \text{m/s} \)?

  • A. \( 2.5 \times 10^8 \, \text{m/s} \)
  • B. \( 2.0 \times 10^8 \, \text{m/s} \)
  • C. \( 3.0 \times 10^8 \, \text{m/s} \)
  • D. \( 1.5 \times 10^8 \, \text{m/s} \)

Q5. What is the shape of the refracted wavefront when a plane wave passes through a convex lens and converges to a point?

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

+ 5 more questions in the actual test

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