Light - reflection and refraction
Spherical mirrors, the mirror formula and magnification, refraction through a glass slab, lenses, the lens formula and power. Sign convention is where most of the arithmetic goes wrong.
Class 10 · Physics
Class 10 Physics tuition: ray diagrams and the numerical chain
Class 10 Physics covers light—reflection and refraction, the human eye and the colourful world, electricity, and magnetic effects of electric current. In CBSE, these topics sit within a single Science paper rather than a separate subject. Two elements carry the bulk of the marks: ray diagrams, which must be drawn rather than described in words, and multi-step numerical problems in electricity.
Class 10 Physics is unusual in board exams because much of the credit is not essay. Ray diagrams earn marks for arrows, labels and image position - a beautiful drawing without arrows scores poorly. Electricity is the opposite: long chains of numericals where an early error cascades, and a child who cannot verify their own work loses everything that follows.
A free 20-minute assessment. We find where your child actually is, then tell you what we would do about it. No card, no commitment.
What is taught
The Class 10 Physics syllabus, topic by topic
The human eye and the colourful world
Accommodation, defects of vision and their correction, dispersion through a prism, atmospheric refraction and scattering - why the sky is blue and the setting sun red.
Electricity
Current, potential difference, Ohm's law, resistance and resistivity, series and parallel combinations, and heating effect with power. The most numerical-heavy chapter in the course.
Magnetic effects of electric current
Magnetic field and field lines, field due to a current-carrying conductor and solenoid, force on a conductor, Fleming's rules, electromagnetic induction and the domestic circuit.
Class 10 Physics in detail
Why do ray diagrams lose so many marks?
Diagrams are marked as answers, not artwork. Credit comes from the arrows that show direction, the labelled focus and centre of curvature, and the image placed in the right position with the correct nature. A neat diagram without arrows will score less than a rough one that includes them.
Children treat a ray diagram as illustration. Examiners treat it as working. That mismatch costs many marks across a board paper. But it is entirely fixable because the requirements are short and fixed: two standard rays, arrows on every ray, focus and centre marked, image drawn and its nature stated.
We teach it as a checklist that gets applied every time, including in rough work, until it becomes automatic. The point is not neatness. It is that each item on the checklist carries a mark.
How should a Class 10 electricity numerical be set out?
Have your child write the given quantities first, then the formula, then the substitution, then the answer with its unit. In multi-step problems, each stage gets its own line. This contains an error rather than carrying it forward. Substituting the final answer back is the fastest way to catch slips before the paper is handed in.
Electricity determines success or failure in physics units, because the questions are long. A child who works in their head to save time loses the method marks and cannot find their own mistake afterwards. A single slip in line two costs everything after it.
Writing each stage down appears slower but is not, because the checking is faster. It is the same discipline the Class 9 numericals should have instilled, which is why a child who skipped that habit meets it again here under board pressure.
Should we get help for physics alone?
Only if physics is genuinely the weak strand. Class 10 CBSE has a single Science paper covering all three subjects, so marks lost in chemistry cannot be compensated by strength in physics. The assessment reveals which strand is actually costing you marks before you commit to any tutoring plan.
Parents usually name a strand because that is where the child says they are struggling. But children are not always accurate about where they are actually weak. Sometimes the reported problem is physics numericals when the actual problem is that equations are not being balanced in chemistry - the same paper, a different chapter, and a much bigger mark loss.
That's why we assess the whole paper first and then say plainly where your tutoring hour is best spent. If your child does not need physics help, we will tell you that directly. The full subject is covered on the Class 10 Science page.
At a glance
Class 10 Physics, topic by topic
What the year covers, and what a child on track can do by the end of it.
| Topic | What the year actually asks for |
|---|---|
| Light - reflection and refraction | Spherical mirrors, the mirror formula and magnification, refraction through a glass slab, lenses, the lens formula and power. Sign convention is where most of the arithmetic goes wrong. |
| The human eye and the colourful world | Accommodation, defects of vision and their correction, dispersion through a prism, atmospheric refraction and scattering - why the sky is blue and the setting sun red. |
| Electricity | Current, potential difference, Ohm's law, resistance and resistivity, series and parallel combinations, and heating effect with power. The most numerical-heavy chapter in the course. |
| Magnetic effects of electric current | Magnetic field and field lines, field due to a current-carrying conductor and solenoid, force on a conductor, Fleming's rules, electromagnetic induction and the domestic circuit. |
On track by the end of Class 10 looks like
- Draws a ray diagram with arrows, labels and a correctly placed image, not merely a neat sketch
- Applies the sign convention consistently in the mirror and lens formulae
- Works a multi-step electricity numerical and checks it by substituting back
- Uses Fleming's left- and right-hand rules without confusing which applies
- Explains a defect of vision and its correction in terms of where the image forms
Where children usually come unstuck
- Ray diagrams drawn without arrows, which score a fraction of the marks
- Sign convention applied inconsistently, so a correct method gives a wrong sign
- Series and parallel formulae swapped under exam pressure
- One early slip in a numerical chain carrying through to every later line
- Confusing Fleming's left-hand rule with the right-hand rule
Fees
What Class 10 Physics tuition costs
What Class 10 tuition costs
Class 10 sits in Class 9 and 10. Board-exam teaching, with past papers and marking schemes.
- Spoken English8 live classes/month
- ₹2,000/month
- All Subjects16 live classes/month
- ₹5,000/month
- One-to-One12 live classes/month
- ₹8,000/month
Per child, per month. See every plan and what is included.
How we checked this
What this page is built on
Everything above about the syllabus is checked against the boards’ own material rather than against other tuition sites. If a claim cannot be traced back to one of these, it is not on the page.
Same class
Everything else we teach in Class 10
Questions
Class 10 Physics, answered
Is physics a separate paper in Class 10 CBSE?
No. Physics, chemistry and biology remain on a single Science paper through Class 10, then become separate subjects in Class 11. A few ICSE and international schools do separate them earlier, so confirm the timeline with your child's school.
My child draws neat ray diagrams and still loses marks. Why?
The most common mistakes are missing arrows, or an unlabelled focus and centre of curvature, or the image drawn in the wrong place. Ray diagrams are marked by component, not as a whole picture. Each of these carries its own mark, so none can be skipped.
Which Class 10 physics chapter is hardest?
Electricity is difficult for most children. The numericals are long, and an early mistake cascades through the whole answer. The solution: set out the work line by line so errors stay isolated and can be traced.
How much of the Class 10 Science paper is physics?
Roughly one-third, alongside Chemistry and Biology, though the exact weighting is set each year. Check the current sample paper and syllabus on the CBSE website rather than relying on last year's figures.
How much of the Class 10 Science paper is physics?
Roughly a third of the Science marks, sharing the paper with Chemistry and Biology. The precise weighting varies each year. Rather than assuming last year's split, check the current sample papers on the CBSE Academic website.
My child draws neat ray diagrams and still loses marks. Why?
Almost certainly missing the arrows, an unlabelled focus or centre of curvature, or the image positioned incorrectly where the light actually forms. Ray diagrams are assessed as working, not merely as a visual illustration, and each component carries separate marks.
Which chapter should we start with if time is short?
Electricity. It carries the most numericals, questions are long, and a single early error propagates through an entire answer. This is where a fortnight of disciplined, careful setting-out will move the most marks.
Is it worth learning derivations?
For named syllabus items, yes, because they are asked directly. However, a derivation memorised without understanding falls apart the instant the question changes even one detail—and that is exactly what boards do.
How do I help if I do not know physics?
Read the answers, not the working, and check every number carries a unit. Then ask what the arrows on a ray diagram mean. Both find real lost marks and need no physics from you.
Does Class 10 physics matter for Class 11?
A great deal if your child takes science. Class 11 assumes the sign convention, the formula-substitution habit and comfort with numericals are already automatic, and it moves far faster than Class 10 did.
Free · no card needed
See how your child is doing in Class 10 Physics.
A free 20-minute assessment. We find where your child actually is, then tell you what we would do about it. No card, no commitment.
- Tell us the class, the board, and where it is going wrong.
- We find a teacher who has taught that exact thing, and offer a slot.
- A free 20-minute assessment - stay and watch if you would like to.
- No card, nothing to commit to
- Live classes, never a crowded room
- One teacher, every single week