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Reflection of Light

ICSE · Class 9 · Physics

Quick revision notes for Reflection of Light — ICSE Class 9 Physics. Key concepts, formulas, and definitions for last-minute revision.

44 questions37 flashcards5 concepts

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Ray diagrams showing image formation by a convex mirror for two object positions: at infinity and at a finite distance from the mirror. Each diagram should clearly show the object, mirror, principal a
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Key Topics to Revise

1

1. Basic Ideas of Reflection

  • Reflection means the return of light into the same medium after striking a surface.
  • A plane mirror does not reflect 100% of the light falling on it.
  • Regular reflection occurs on a smooth and polished surface such as a plane mirror.
2

2. Laws of Reflection and Image Formation by a Plane Mirror

  • First law of reflection: angle of incidence equals angle of reflection.
  • Second law of reflection: incident ray, reflected ray, and normal lie in the same plane.
  • A plane mirror forms a virtual, erect image of the same size as the object.
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3. Images Formed by Two Plane Mirrors

  • For two mirrors kept parallel, an infinite number of images are formed for an object kept in between them.
  • For two mirrors kept perpendicular, three images are formed for an object kept in between them.
  • For mirrors inclined at angle θ, the number of images depends on n = 360°/θ°.
4

4. Spherical Mirrors and Key Terms

  • A reflecting surface which is a part of a sphere is called a spherical mirror.
  • Concave mirror is made by silvering the outer surface of a hollow sphere so that reflection takes place from the hollow concave surface.
  • Concave mirror converges parallel rays and has a real focus.

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Full Notes

Key Concepts

The return of light intoRegular reflection occurs on smoothThe angle of incidence is equalA plane mirror forms a virtualThe interchange of left and right

Frequently Asked Questions

What are the important topics in Reflection of Light for ICSE Class 9 Physics?
Reflection of Light covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Reflection of Light — ICSE Class 9 Physics?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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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