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Reflection of Light: Spherical Mirrors — Syllabus

ICSE · Class 12 · Physics

What Reflection of Light: Spherical Mirrors covers in ICSE Class 12 Physics: 4 topics, for the 2026-27 session. Part of the ICSE Class 12 Physics syllabus.

44 questions30 flashcards12 formulas & key relations5 concepts

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A labeled diagram illustrating key terms associated with spherical mirrors, such as pole, center of curvature, radius of curvature, principal axis, and focal point.
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4 Topics · ICSE Class 12 Physics · 2026-27

Topics in Reflection of Light: Spherical Mirrors

1

1. Basic Terms and Types of Spherical Mirrors

  • A spherical mirror is a part of a hollow sphere with one side silvered and coated, and the other side acting as the reflecting surface.
  • A concave mirror is one whose reflecting surface is towards the centre of the sphere of which the mirror is a part.
  • A convex mirror is one whose reflecting surface is away from the centre of the sphere of which the mirror is a part.
2

2. Rays, Images, and Ray Diagrams

  • Rays close to the principal axis are paraxial rays.
  • Rays quite distant from the principal axis are marginal rays.
  • Most derivations relating object and image parameters are valid only for paraxial rays.
3

3. New Cartesian Sign Convention

  • The pole is taken as the origin.
  • The principal axis is the X-axis, and a perpendicular line through the pole is the Y-axis.
  • Distances to the right of the pole are positive, and distances to the left are negative.
4

4. Focal Length and Radius of Curvature

  • For a spherical mirror of aperture small compared with its radius of curvature, the focal length is one-half the radius of curvature.
  • The relation f = R/2 is strictly valid for paraxial rays.
  • For marginal rays and large aperture, the more general relation must be used.

Key Concepts

Central concept: Spherical mirrors form images by regular reflection and are described using principal axis, focus, curvature, sign convention, mirror formula, magnification, and applications.

Types of spherical mirrorsBasic parts and definitionsRay optics and reflection rulesParaxial and marginal raysFocal length and radius relationImage formationNew Cartesian sign conventionMirror formula

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Frequently Asked Questions

What are the important topics in Reflection of Light: Spherical Mirrors for ICSE Class 12 Physics?
Key topics in Reflection of Light: Spherical Mirrors include Basic Terms and Types of Spherical Mirrors, Rays, Images, and Ray Diagrams, New Cartesian Sign Convention, Focal Length and Radius of Curvature. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Reflection of Light: Spherical Mirrors for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Reflection of Light: Spherical Mirrors. 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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