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Indian Navy INET Wave Optics — practice questions

Explore 3 free Wave Optics questions in Indian Navy INET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Wave Optics questions and exercises with answers

Showing questions 1–3 of 3.

When light goes from a less dense to denser medium (e.g., air to water), it bends:Read the answer and worked solution →Diffraction is the:Read the answer and worked solution →Resolving power of diffraction grating with N lines:Read the answer and worked solution →

Worked practice questions

When light goes from a less dense to denser medium (e.g., air to water), it bends:

  1. Away from normal
  2. Toward normal
  3. Stays straight
  4. Reverses direction
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Correct answer: B. Toward normal

When entering denser medium, speed decreases, ray bends toward normal. From denser to less dense, ray bends away from normal.

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Diffraction is the:

  1. Splitting of light into colours
  2. Bending of waves around obstacles or at apertures
  3. Total reflection
  4. Polarization
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Correct answer: B. Bending of waves around obstacles or at apertures

Diffraction is the bending of waves around obstacles or through apertures, more pronounced when obstacle size is comparable to wavelength. All wave phenomena (light, sound, water waves) exhibit diffraction.

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Resolving power of diffraction grating with N lines:

  1. Independent of N
  2. 1
  3. N²
  4. Nm (where m = order of diffraction) — Rayleigh criterion
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Correct answer: D. Nm (where m = order of diffraction) — Rayleigh criterion

R = λ/Δλ = Nm. More lines (or higher order) means finer resolution. Used in spectrometers to separate close spectral lines (e.g., sodium D-line doublet).

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