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SubjectsScience
लेंस
In Class 10 Science, the Lenses topic from Light Reflection and Refraction explains how convex and concave lenses bend light to form images. Students study principal rays, image formation for different object positions, ray diagrams, and the relationship between object distance, image distance, and focal length through the lens formula. The topic also introduces magnification, lens power, sign conventions, and everyday uses of lenses in optical instruments.
TOPIC PRACTICE
Up to 1 questions from this page. Select your focus, then start.
The unit of power of a lens is dioptre (D). Since \(P = \frac{1}{f}\), where \(f\) is the focal length in metres, a lens with focal length 1 m has power 1 dioptre. Metre is the unit of focal length, not lens power. Exam tip: convert focal length into metres before using \(P = 1/f\).
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