Chapter 3 of 7
Syllabus
Lenses — Syllabus
Kerala Board · Class 10 · Physics
What Lenses covers in Kerala Board Class 10 Physics: 4 topics, for the 2026-27 session. Part of the Kerala Board Class 10 Physics syllabus.
44 questions24 flashcards3 formulas & key relations5 concepts
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4 Topics · Kerala Board Class 10 Physics · 2026-27
Topics in Lenses
1
Types of Lenses and Their Properties
- A lens is a transparent medium with two refracting surfaces that are parts of spheres
- Convex lens: Thicker at center, converges parallel rays to a real focus
- Concave lens: Thinner at center, diverges parallel rays from a virtual focus
2
Ray Diagrams and Image Formation
- Three principal rays: parallel to axis, through optic centre, through/towards focus
- Parallel ray to convex lens passes through far-side focus after refraction
- Ray through optic centre passes straight without deviation
3
Image Characteristics for Different Object Positions
- Convex lens - Object beyond 2F: Image between F and 2F, real, inverted, diminished
- Convex lens - Object at 2F: Image at 2F, real, inverted, same size
- Convex lens - Object between F and 2F: Image beyond 2F, real, inverted, magnified
4
Lens Equation and Sign Convention
- Lens equation relates focal length, object distance, and image distance
- Cartesian sign convention: distances measured from optic centre
- Positive direction: same as incident light; Negative: opposite to incident light
Key Concepts
Convex lensPrincipal focus (F) is the pointFor ray diagrams1/f = 1/vm = hi/ho = v/u
Work through every topic in Lenses with notes and quizzes
Start This ChapterFrequently Asked Questions
What are the important topics in Lenses for Kerala Board Class 10 Physics?
Key topics in Lenses include Types of Lenses and Their Properties, Ray Diagrams and Image Formation, Image Characteristics for Different Object Positions, Lens Equation and Sign Convention. Study these first, then practise questions on each for the Kerala Board Class 10 board exam.
How should I revise Lenses for the Kerala Board Class 10 board exam?
Learn the core ideas first, then work through the 44 practice questions on Lenses. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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