BPHCT-137 IGNOU Solved Assignment 2026-27

BPHCT-137 Solved Assignment: Waves and Optics (TMA 30% Weightage)

This plagiarism-free, university-verified digital PDF solution strictly follows the official IGNOU curriculum for BPHCT-137 (Waves and Optics), designed for Bachelor of Science (BSCG) students. All answers comply with word limits (500/250/100 words) and current submission deadlines.

Key Syllabus Units Covered

• Unit 1: Mechanical Waves and Wave Motion
  • Mathematical representation of waves (transverse/longitudinal), wave equation, and energy propagation.
  • Solutions for interference patterns, diffraction gratings, and resonance in pipes (verified numerical problems).
  • Conceptual Q&A: ‘How does the phase difference affect constructive/destructive interference in a double-slit experiment?’
• Unit 2: Sound Waves and Acoustics
  • Doppler effect derivation, intensity levels, and human hearing thresholds (with step-by-step calculations).
  • Standing waves in strings and air columns (boundary conditions, harmonic frequencies).
  • Conceptual Q&A: ‘Why does a closed pipe produce only odd harmonics while an open pipe produces all harmonics?’
• Unit 3: Electromagnetic Waves and Polarization
  • Maxwell’s equations and wave propagation in vacuum/medium (refractive index, dispersion).
  • Polarization by reflection, double refraction, and Malus’ law (with solved examples).
  • Conceptual Q&A: ‘Explain the physical significance of Brewster’s angle in terms of molecular alignment.’
• Unit 4: Geometrical and Physical Optics
  • Lens formula, mirror equation, and aberrations (spherical/chromatic) with ray diagrams.
  • Diffraction at single/slit and circular apertures (Fraunhofer/Fresnel regimes).
  • Conceptual Q&A: ‘How does the wavelength of light determine the resolving power of a telescope?’
• Unit 5: Optical Instruments and Applications
  • Working principles of microscopes, telescopes, and spectrometers (magnification calculations).
  • Fiber optics: total internal reflection and attenuation in communication systems.

Assignment Structure and Verification

The solution includes:

• All mandatory questions from the IGNOU TMA guide (2026-27 session).
• Numerical problems with detailed unit conversions and dimensional analysis.
• Diagrams for wave interference, polarization, and optical instrument setups.
• Cross-referenced with IGNOU study material (Block 1–5) for alignment.

Submission Guidelines

Adhere to:

• Word limits: 500 words (Q1–Q3), 250 words (Q4–Q6), 100 words (short-answer).
• Deadlines: Check IGNOU’s official portal for semester-specific submission dates.
• Formatting: 12pt Times New Roman, 1.5 line spacing, numbered questions.