Class 12 Physics formulas: Wave optics , dual nature of light most important formulas
1. Direct Use in Board-Exam Numericals
- Wave Optics (YDSE, diffraction, polarization) and
- Dual Nature of Light (photoelectric effect, de-Broglie wavelength)
80–90% numericals are formula-based
अगर formulas याद और clear हैं, तो numericals fast और accurate हो जाते हैं।
🔹 2. Time Management Improve होता है
- Exam में lengthy derivation सोचने की जरूरत नहीं
- Formula recall → direct substitution
Paper जल्दी complete होता है, last-minute panic नहीं होता।
🔹 3. Concept Clarity Strong होती है
Formulas सिर्फ calculation नहीं सिखाते, बल्कि:
- Wave Optics → light की wave nature
- Dual Nature → wave + particle behaviour
👉 Theory questions भी आसान लगते हैं।
🔹 4. High-Weightage Topics Cover होते हैं
Wave Optics
- Fringe width
- YDSE conditions
- Diffraction minima
- Brewster’s law
Dual Nature of Light
- Photoelectric equation
- Threshold frequency
- de-Broglie wavelength
ये topics हर साल exam में आते हैं।
🔹 5. Assertion–Reason & MCQs में मदद
- Formula-based relations से:
- Options eliminate करना आसान
- Assertion-Reason जल्दी solve
Guesswork कम, accuracy ज़्यादा।
🔹 6. Derivation Writing आसान होती है
- Board में full derivation नहीं भी आए तो:
- Starting equation
- Final result
सिर्फ formulas याद होने से 2–3 marks secure हो जाते हैं।
🔹 7. Competitive Exams (NEET / JEE) के लिए भी Useful
- Photoelectric effect
- de-Broglie wavelength
- Fringe width
👉 Same formulas multiple exams में काम आते हैं।
🔹 8. Last-Month & One-Day Revision के लिए Best
- Short formula sheet → quick revision
- Weak chapters पर focus
Wave optics Formula
Interference of Light
Young’s Double Slit Experiment (YDSE)
Class 12 Physics formulas: Wave optics , dual nature of light most important formulas
Diffraction of Light
.Polarisation of Light
Resolving Power
Refractive Index & Wavelength
MOST IMPORTANT EXAM POINTS
- Fringe width independent of intensity
- Interference → redistribution of energy
- Polarisation proves light is transverse
- Central maximum is brightest and widest
Dual nature of radiation and matter
Class 12 Physics formulas: Wave optics , dual nature of light most important formulas
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