Wave Optics
Class 12 Physics · Physics Part II · Chapter 2
CBSE Class 12 Board Examination community
View all
Physics, Chemistry, Maths + English
8~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Mathematics
- Physics
- + 3 more
Physics, Chemistry, Biology + English
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Physics
- Chemistry
- + 3 more
Physics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Physics
Accountancy, Business Studies, Economics + English
9~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Accountancy
- Business Studies
- + 3 more
Physics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Physics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
TrendingStart now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
History
3~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- History
Hindi Elective
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- हिंदी
Mathematics
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Mathematics
Sociology
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Sociology
Economics
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Economics
Home Science
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Home Science
Urdu Elective
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- اردو
- Urdu Elective
Geography
3~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Geography
Accountancy
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Accountancy
English Core
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Flamingo
- Vistas
Political Science
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Political Science
Chemistry
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Chemistry
Business Studies
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Business Studies
Hindi Core
2~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- हिंदी
Mathematics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदी (आधार)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Accountancy
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
اردو (اختیاری)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Mathematics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदी (आधार)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
संस्कृतम् (केन्द्रिकम्)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदी (ऐच्छिक)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
संस्कृत (ऐच्छिक)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदी (ऐच्छिक)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
اردو (کور)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Chemistry
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Urdu Elective
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Computer Science
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Chemistry
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Fine Art · Painting
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
TrendingStart now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदुस्तानी संगीत (गायन / वादन)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Biology
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Informatics Practices
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Accountancy
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Biotechnology
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Accountancy
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
सृजनात्मक लेखन और अनुवाद
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Business Studies
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
हिंदुस्तानी संगीत (तबला / पखावज)
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Business Studies
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Economics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Economics
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
TrendingStart now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
History
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
History
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
History
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Geography
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Geography
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Geography
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
English Elective · Kaleidoscope
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Political Science
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Political Science
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Sociology
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Sociology
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Psychology
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
English Core · Flamingo
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
English Core · Vistas
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Home Science
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Home Science
~50days leftPre-boards · school dates varyDec 2026 · school-specific · tentative
Start now for December pre-boards. Reuse it for boards.- Space weighted by unit marks
- Charts from the book's own data
- Traps corrected
Summary
Wave optics explains phenomena that ray optics cannot, by treating light as a wave. Huygens' principle, in which every point on a wavefront is a source of secondary wavelets, derives the laws of reflection and refraction. When two coherent waves overlap they interfere; Young's double-slit experiment produces alternating bright and dark fringes of spacing \(\beta=\dfrac{\lambda D}{d}\), bright where the path difference is an integral multiple of \(\lambda\) and dark where it is an odd multiple of \(\lambda/2\). Coherence—a constant phase relationship—is essential for stable fringes. Diffraction, the bending of light around obstacles and slits, gives a central bright maximum flanked by weaker minima, with the first minimum at \(a\sin\theta=\lambda\); this sets the ultimate resolution limit of optical instruments. Polarisation reveals the transverse nature of light: unpolarised light becomes plane-polarised on passing through a Polaroid, obeying Malus' law \(I=I_0\cos^2\theta\), and on reflection at Brewster's angle \(\tan i_B=n\). Together these effects confirm light's wave character and underpin modern optical technology.
Huygens' principle and wavefrontsInterference and Young's experimentCoherence and path differenceDiffraction at a single slitResolving powerPolarisation, Malus' and Brewster's laws
Key terms
Wavefront
Surface of constant phase; every point is a source of secondary wavelets.
Coherence
Constant phase relationship between sources, needed for stable interference.
Fringe width
Spacing between adjacent bright (or dark) fringes, \(\beta=\lambda D/d\).
Diffraction
Bending and spreading of waves around obstacles and through slits.
Polarisation
Restriction of light vibrations to one plane, showing light is transverse.
Brewster's angle
Angle of incidence \(i_B\) giving fully polarised reflected light, \(\tan i_B=n\).
Extra questions & answers
Try one from this chapter
According to Huygens' principle, every point on a wavefront acts as a source of: