Lenses
Kerala Board · Class 10 · Physics
Complete topic list for Lenses in Kerala Board Class 10 Physics. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Lenses
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
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
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
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
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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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