NEET Physics: Wave Optics — MCQ Test 4

Q6. What is the angular position of the third minimum in a single-slit diffraction pattern if the slit width is \( 6.0 \, \mu\text{m} \) and the wavelength is \( 480 \, \text{nm} \)?

Q7. In a single-slit diffraction pattern, what happens to the central maximum’s width if the wavelength is quadrupled?

Q8. What happens to the intensity of light when it passes through a polaroid and the polaroid is rotated by \( 90^\circ \) from its initial position?

Q9. Why does the wave theory require light to propagate as transverse waves to explain polarization?

Q10. What is the shape of the wavefront after a plane wave passes through a thin prism?

Q11. Why does the intensity of light remain unchanged in terms of energy when it undergoes interference or diffraction?

Q12. What is the refractive index of a medium if the critical angle for light passing into air is \( 36.9^\circ \)?

Q13. In a double-slit experiment, if the intensity at the central maximum is \( 4I_0 \), what is the intensity where the path difference is \( \lambda/4 \)?

Q14. In a double-slit experiment, if the slit separation is doubled, what happens to the fringe width?

NEET Physics — Wave Optics

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What is the angular width of the central maximum in a single-slit diffraction pattern if the slit width is \( 3.0 \, \mu\text{m} \) and the wavelength is \( 450 \, \text{nm} \)?

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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 14 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 Diffraction, Wavelength, Wavefront, Intensity, Transmitted, and Polaroids.

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 angular width of the central maximum in a single-slit diffraction pattern if the slit width is \( 3.0 \, \mu\text{m} \) and the wavelength is \( 450 \, \text{nm} \)?

  • A. 15°
  • B. 17.2°
  • C. 20°
  • D. 10°

Q2. What is the shape of the wavefront emitted by a point source in a uniform medium close to the source?

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

Q3. Why does the intensity of light transmitted through two polaroids drop to zero when their pass-axes are perpendicular?

  • A. Frequency cancels
  • B. Wavelength doubles
  • C. Amplitude increases
  • D. No electric field component passes

Q4. What is the resultant amplitude of two coherent waves of amplitude \( a \) with a phase difference of \( 6\pi \)?

  • A. \( a \)
  • B. \( a\sqrt{2} \)
  • C. \( 0 \)
  • D. \( 2a \)

Q5. Why does the intensity of transmitted light through a polaroid decrease when rotated, even if the incident light is unpolarized?

  • A. Frequency reduction
  • B. Polarization of unpolarized light
  • C. Amplitude doubling
  • D. Speed variation

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