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.
Key Topics to Revise
Basic Concepts of Reflection
- Reflection is the return of light into the same medium after striking a surface
- We see objects because they reflect light which reaches our eyes
- Regular reflection occurs on smooth, polished surfaces like mirrors
Laws of Reflection
- First Law: Angle of incidence equals angle of reflection (∠i = ∠r)
- Second Law: Incident ray, reflected ray, and normal lie in the same plane
- These laws apply to all types of reflecting surfaces
Image Formation by Plane Mirror
- Images formed are virtual, erect, same size, and laterally inverted
- Image distance behind mirror equals object distance in front
- Virtual image cannot be obtained on screen but can be seen by eye
Multiple Images in Mirror Systems
- Two parallel mirrors produce infinite images
- Two perpendicular mirrors produce exactly 3 images
- For mirrors at angle θ: Number of images = (360°/θ) - 1 when n is even
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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.
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