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Formula Sheet

Wave Phenomena and Light — Formula Sheet

NIOS · Class 12 · Physics

11 formulas from Wave Phenomena and Light (NIOS Class 12 Physics) on one page, grouped by topic. Part of the NIOS Class 12 Physics syllabus.

44 questions30 flashcards11 formulas & key relations5 concepts

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Illustrates Huygens' principle, showing a primary wavefront and how each point on it acts as a source of secondary wavelets, forming a new wavefront.
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11 Entries · 4 Sections

Formulas and Key Relations

Interference of Light — Young's Double Slit Experiment

I ∝ 4a² cos²(δ/2)

A = 2a cos(δ/2)

Δ = (λ/2π) × δ

Δ = d sinθ ≈ xd/D

(xₙ)bright = nλD/d

Diffraction of Light — Single Slit

Condition for minima: a sinθ = nλ (n = ±1, ±2, ...)

Width of central maximum = 2λD/a

Polarisation of Light and Brewster's Law

μ = tan iₚ (Brewster's Law)

iₚ + r = 90°

Constructive interference

path difference = nλ produces bright fringes

Destructive interference

path difference = (2n+1)λ/2 produces dark fringes

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Frequently Asked Questions

What are the important topics in Wave Phenomena and Light for NIOS Class 12 Physics?
Key topics in Wave Phenomena and Light include Huygens' Principle and Wave Propagation, Interference of Light — Young's Double Slit Experiment, Diffraction of Light, Polarisation of Light. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How many formulas are in Wave Phenomena and Light?
This sheet lists 11 formulas from Wave Phenomena and Light, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Wave Phenomena and Light for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Wave Phenomena and Light. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All NIOS Class 12 Physics Formula Sheet

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