Wave Optics for JEE

• Path difference nλ gives bright fringes; (n + ½)λ gives dark
• Fringe width depends on λ, D and d
• A thin film in one slit shifts the whole pattern
• Malus' law for polarised light

• Fringe width β = λD/d
• Intensity I = 4I₀ cos²(φ/2)
• Fringe shift = (μ − 1)tD/d
• Single slit minima: a sinθ = nλ; Malus: I = I₀ cos²θ

Printable Wave Optics formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

• Using the YDSE minima condition for single-slit diffraction
• Forgetting λ changes inside a medium (λ/μ)
• Wrong direction of fringe shift

Appears frequently. YDSE is the main source of questions. Learn intensity and fringe-shift results well.

Prerequisites: Waves and Sound.

Chapter names follow the current rationalised NCERT textbooks. Read these sections before solving PYQs.

Full-chapter free lectures picked from YouTube search results by views, from established JEE channels (mostly in Hinglish). Use the subtopic list to jump straight to the part you need (timestamps come from each video's own chapter list). Watch one, then solve PYQs the same day.

• WAVE OPTICS in 1 Shot : All Concepts & PYQs Covered || JEE Main & Advanced — JEE Wallah, 5:07:53
  Jump to a subtopic (10)

  • 00:00 Introduction
  • 05:48 Huygens Principle
  • 15:02 Wavefront
  • 30:36 Wave Equation
  • 1:05:10 Interference
  • 1:39:10 Young’s Double Slit Experiment
  • 2:49:35 Shape of Fringes
  • 3:50:20 Polarisation of Light
  • 4:31:05 Diffraction of Light
  • 5:07:10 Thankyou bachhon!
• Wave Optics ONE SHOT| Class 12th Physics | JEE Mains & Advance — Lakshya JEE, 1:14:04

• 11 JEE Main 2026 PYQs on Wave Optics, with solutions.
• Read the chapter in NCERT textbooks (official, free), then solve its NCERT Exemplar (official, free) questions.
• Chapter-wise past questions: JEE Main and Advanced PYQs and question bank.
• Timed practice tests: NTA Abhyas practice tests (official, free) and our free mock tests.
• See it move: interactive simulation.