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Class 10 Physics – Light: Reflection and Refraction | Short Revision Notes

PHY101 Class 10 Physics · Other

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Short revision notes covering reflection of light, laws of reflection, spherical mirrors, mirror formula, refraction of light, refractive index, lenses, lens formula, magnification, and power of a lens. Includes key definitions, formulas, and a quick self-test with answers.

These notes provide a quick revision of key concepts and formulas from Light: Reflection and Refraction. Please check your syllabus for complete exam preparation.

Pages
2
Academic year
2025/2026
Language
English

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Class 10 Physics • Original Quick Revision Notes Page 1 CLASS 10 PHYSICS QUICK REVISION NOTES • LIGHT: REFLECTION AND REFRACTION Purpose: Original study summary for quick revision. Check your board syllabus and sign convention before using these notes for an exam. 1. Reflection of Light Reflection is the return of light into the original medium after it strikes a surface. Laws of reflection 1. Angle of incidence equals angle of reflection ( ∠ i = ∠ r). 2. The incident ray, reflected ray and normal lie in the same plane. 2. Spherical Mirrors Term Meaning Concave mirror Reflecting surface curves inward; it can form real or virtual images depending on object position. Convex mirror Reflecting surface bulges outward; for a real object it forms a virtual, erect and diminished image. Pole (P) Geometric centre of the reflecting surface. Centre of curvature (C) Centre of the sphere of which the mirror is a part. Principal focus (F) Point where rays parallel to the principal axis meet, or appear to come from, after reflection. Focal length (f) Distance between pole and principal focus. For a spherical mirror (using the usual paraxial approximation): R = 2f Mirror formula and magnification 1/f = 1/v + 1/u m = h n /h n = − v/u Here, u = object distance, v = image distance, f = focal length, h n = image height and h n = object height. Use the Cartesian sign convention consistently.

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