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Revision Notes

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.

41 questions68 flashcards5 concepts

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Key Topics to Revise

1

1. Spherical Mirrors

  • Mirrors whose reflecting surfaces are spherical are called spherical mirrors.
  • A concave mirror has a reflecting surface curved inwards.
  • A convex mirror has a reflecting surface curved outwards.
2

2. Images Formed by Mirrors

  • A plane mirror always forms an erect image of the same size as the object.
  • In a concave mirror, when the object is close, the image is erect and enlarged.
  • In a concave mirror, when the object moves farther away, the image becomes inverted and first enlarged, then diminished.
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3. Uses of Concave and Convex Mirrors

  • Reflectors of torches and headlights of cars and scooters are concave in shape.
  • A dentist uses a concave mirror to get an enlarged view of teeth when held close.
  • Most modern telescopes are reflecting telescopes with a large concave mirror as the main mirror.
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4. Laws of Reflection

  • The ray of light falling on a mirror is called the incident ray.
  • The ray that comes back from the mirror is called the reflected ray.
  • The normal is a line making 90° to the mirror surface at the point of incidence.

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Full Notes

Key Concepts

Mirrors whose reflecting surfaces are sphericalA concave mirror curves inwardA convex mirror curves outwardThe incident rayA ray falling on a mirror

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?
Understand the core concepts first, then work through the 41 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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