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Revision Notes

Lenses

Maharashtra Board · Class 10 · Science

Quick revision notes for Lenses — Maharashtra Board Class 10 Science. Key concepts, formulas, and definitions for last-minute revision.

44 questions36 flashcards5 concepts

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Key Topics to Revise

1

1. Types of Lenses and Basic Terms

  • A lens is a transparent medium bound by two surfaces.
  • A convex lens has two spherical surfaces puffed up outwards and is thicker at the centre than at the edges.
  • A concave lens has both surfaces spherical on the inside and is thinner at the centre than at the edges.
2

2. Ray Rules and Image Formation

  • For a convex lens, a ray parallel to the principal axis passes through the principal focus after refraction.
  • For a convex lens, a ray passing through the principal focus becomes parallel to the principal axis after refraction.
  • For a convex lens, a ray passing through the optical centre goes straight without changing direction.
3

3. Sign Convention, Lens Formula, Magnification, and Power

  • The object is always placed on the left of the lens.
  • Distances measured to the right of the optical centre are positive.
  • Distances measured to the left of the optical centre are negative.
4

4. Human Eye and Vision

  • The cornea is a thin transparent membrane covering the human eye through which light enters.
  • Maximum refraction occurs at the outer surface of the cornea.
  • The iris is a dark, fleshy screen behind the cornea and its colour differs between people.

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Full Notes

Key Concepts

A lens is a transparent mediumThe optical centre is the pointA ray parallel to the principalA convex lens can form realA concave lens always forms

Frequently Asked Questions

What are the important topics in Lenses for Maharashtra Board Class 10 Science?
Lenses covers several key topics that are frequently asked in Maharashtra Board Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Lenses — Maharashtra Board Class 10 Science?
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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