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Light: Mirrors and Lenses

CBSE · Class 8 · Science

Quick revision notes for Light: Mirrors and Lenses — CBSE Class 8 Science. Key concepts, formulas, and definitions for last-minute revision.

42 questions22 flashcards5 concepts

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Key Topics to Revise

1

10.1 Spherical Mirrors - Types and Identification

  • Spherical mirrors are curved mirrors shaped like a part of a hollow glass sphere
  • Concave mirror: reflecting surface curves inwards (like inner side of a spoon)
  • Convex mirror: reflecting surface curves outwards (like outer side of a spoon)
2

10.2 Image Formation by Spherical Mirrors

  • Concave mirror images: When object is close - erect and enlarged; When object is far - inverted and size varies
  • Convex mirror images: Always erect and diminished (smaller than object)
  • Image size in convex mirror decreases slightly as object moves away
3

10.3 Laws of Reflection

  • First Law: Angle of incidence (i) equals angle of reflection (r)
  • Second Law: Incident ray, normal, and reflected ray all lie in the same plane
  • Laws apply to all mirrors - plane, concave, and convex
4

10.4 Lenses - Types and Properties

  • Lens: transparent material (glass/plastic) with curved surfaces
  • Convex lens: thicker at middle, thinner at edges (converging lens)
  • Concave lens: thicker at edges, thinner at middle (diverging lens)

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Full Notes

Key Concepts

Mirrors with curved reflecting surfaces shapedTwo fundamental lawsTransparent materials with curved surfacesDifferent mirrors and lenses form imagesConcave mirrors and convex lenses converge

Frequently Asked Questions

What are the important topics in Light: Mirrors and Lenses for CBSE Class 8 Science?
Light: Mirrors and Lenses covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Light: Mirrors and Lenses — CBSE Class 8 Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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