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Indian Navy SSR (Sailor) Wave Optics — practice questions

Explore 6 free Wave Optics questions in Indian Navy SSR (Sailor) 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 1–6 of 6.

Two waves with the same frequency and constant phase difference are called:Read the answer and worked solution →Two slits 0.5 mm apart with light of wavelength 5000 Å. The 5th bright fringe is at distance from central maximum on screen 1 m away:Read the answer and worked solution →Wavelength of light in water (n = 4/3) if its vacuum wavelength is 600 nm:Read the answer and worked solution →Polarization establishes that light is:Read the answer and worked solution →Light from a sodium lamp (λ = 590 nm) falls on YDSE with d = 0.5 mm, screen D = 1 m. Fringe width:Read the answer and worked solution →HUYGENS' PRINCIPLE states that every point on a wavefront acts as a:Read the answer and worked solution →

Worked practice questions

Two waves with the same frequency and constant phase difference are called:

  1. Incoherent
  2. Coherent
  3. Polarized
  4. Diffracted
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Correct answer: B. Coherent

Coherent waves maintain a constant phase relationship, required for stable interference patterns. Laser light is coherent. Sunlight is incoherent.

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Two slits 0.5 mm apart with light of wavelength 5000 Å. The 5th bright fringe is at distance from central maximum on screen 1 m away:

  1. 2.5 mm
  2. 5 mm
  3. 7.5 mm
  4. 10 mm
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Correct answer: B. 5 mm

Position of n-th bright fringe: y_n = n λ D/d = 5 × (5000 × 10⁻¹⁰) × 1 / (0.5 × 10⁻³) = 5 × 10⁻³ m = 5 mm.

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Wavelength of light in water (n = 4/3) if its vacuum wavelength is 600 nm:

  1. 450 nm
  2. 600 nm
  3. 800 nm
  4. 900 nm
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Correct answer: A. 450 nm

λ_medium = λ_vacuum / n = 600/(4/3) = 600 × 3/4 = 450 nm. Frequency stays the same; wavelength shrinks in denser media.

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