This page lists every class 10 physics formulas chapter in one place. Class 10 Science has four physics chapters, and each one has its own formula page in this hub. Use the directory below to jump straight to a chapter, or scan the formula-families table if you remember a formula name but not the chapter it belongs to.
Every chapter link below opens that chapter’s formula page, with symbols, SI units and the conditions under which each formula holds. If you are revising, the formula-families table finds the chapter faster than scrolling.
Class 10 Physics Formulas: Chapter Directory
The directory table below links to all four chapters of this hub in NCERT order. The notes in front say which formulas each chapter covers, so you can pick the right page before you tap.
| Ch | Chapter notes | Key topics covered |
|---|---|---|
| 9 | Light – Reflection and Refraction | About These Formulas · Formulas at a Glance · All Formulas, Grouped by Topic |
| 10 | The Human Eye and the Colourful World | About These Formulas · Formulas at a Glance · All Formulas, Grouped by Topic |
| 11 | Electricity | About These Formulas · Formulas at a Glance · All Formulas, Grouped by Topic |
| 12 | Magnetic Effects of Electric Current | About These Formulas · Formulas at a Glance · All Formulas, Grouped by Topic |
- Light – Reflection and Refraction — the mirror formula and lens formula, magnification, refractive index and the power of a lens. This is the chapter for reflection and refraction numericals.
- The Human Eye and the Colourful World — power of accommodation, defects of vision and their lens correction, dispersion through a prism, atmospheric refraction and scattering. Mostly conceptual, with lens power calculations.
- Electricity — Ohm’s law, resistance and resistivity, series and parallel combinations, the heating effect of current, electric power and energy. The numerical-heavy chapter.
- Magnetic Effects of Electric Current — magnetic field lines, force on a current-carrying conductor, Fleming’s rules, solenoid and electromagnet, electric motor and generator, domestic circuits. Application-based, with fewer standalone numericals.
Which Chapter Has the Formula You Need?
If you remember a formula name but not its chapter, use this table. Match the formula family, and the right chapter is one tap away.
| Formula family | What it involves | Chapter |
|---|---|---|
| Mirror formula and lens formula | u, v, f and magnification | Light – Reflection and Refraction |
| Refractive index and Snell’s law | sin i / sin r; speed of light in a medium | Light – Reflection and Refraction |
| Power of a lens | focal length in metres, power in dioptres | Light – Reflection and Refraction; The Human Eye and the Colourful World |
| Ohm’s law, resistance and resistivity | V = IR; R = ρL/A | Electricity |
| Series and parallel combinations | R = R1 + R2; 1/R = 1/R1 + 1/R2 | Electricity |
| Electric power and energy | P = VI; H = I²Rt; energy in kWh | Electricity |
| Magnetic force on a conductor | F = BIL; field patterns around wires and solenoids | Magnetic Effects of Electric Current |
Two warnings before you start working with these formulas:
- Sign conventions matter. u, v and f follow the Cartesian sign convention in both the mirror formula and the lens formula — and the convention differs between mirrors and lenses. Always read a formula together with its sign convention on the chapter page.
- “Power” is ambiguous. The word means two different things in this book: lens power in dioptres in the Light and Human Eye chapters, and electric power in watts in the Electricity chapter.
How to Use This Hub for Revision
Three steps take you from this page to a revised formula list.
- Identify the chapter. If you remember a formula name, use the formula-families table; if you remember the topic, use the directory.
- Open the chapter page. Each page lists that chapter’s formulas with symbols, SI units, and the conditions under which each formula holds.
- Test yourself. Cover the formula column and rewrite each formula from memory, then check the units.
This hub covers only the four physics chapters of Class 10 Science. The other Science chapters — chemical reactions, life processes, and so on — belong to the Science section, not this formulas silo. If you need another class, the main physics formulas hub links every class-level page.
Every formula in this hub follows the NCERT Class 10 Science textbook. To check a result against the source, open the official NCERT text for Light – Reflection and Refraction on the NCERT website.
What You’ll Find on Each Chapter Page
Every chapter page in this hub is built the same way, so you always know where to look.
- Formulas grouped by topic, in the order the chapter teaches them.
- Symbol meanings and SI units for every quantity.
- The conditions or sign conventions that apply to each formula.
- A worked example with original numbers, solved step by step.
- Common mistakes to avoid, including sign and unit errors.
Frequently Asked Questions
Which Class 10 physics chapter has the most formulas?
Electricity and Light – Reflection and Refraction. Both carry the bulk of the formula-based numericals in the board exam. The Human Eye and Magnetic Effects chapters are mostly conceptual, with a few calculations.
Is the Human Eye chapter important for formula questions?
It has few standalone formulas. The main calculation is lens power for correcting myopia and hypermetropia; most questions test dispersion, scattering and the power of accommodation as concepts.
Are these the same as the Class 10 Science chapters?
These four are the physics portion of Class 10 Science. The other Science chapters — chemical reactions, life processes, and so on — are covered in the Science section, not in this formulas hub.
Do I need to learn sign conventions with the mirror and lens formulas?
Yes. The symbols u, v and f follow the Cartesian sign convention, and the convention differs between the mirror formula and the lens formula. Each chapter page states the convention it uses, because most numerical errors in these chapters come from applying the wrong sign.
Reference: NCERT textbooks (CBSE).