CBSE 10 Science · U3
Natural Phenomena
Syllabus-listed 12-mark theory unit covering reflection by curved surfaces, spherical mirrors, mirror formula, magnification, refraction, refractive index, spherical lenses, lens formula, power of a lens, human eye and defects of vision, prism refraction, dispersion, scattering, and daily-life applications. The colour of the sun at sunrise and sunset is explicitly excluded.
Test yourself
A focused, distraction-free run through 65 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 3.1
Reflection by Spherical Mirrors
Concave and convex mirrors, principal focus, centre of curvature, image formation and ray reasoning.
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Topic 3.2
Mirror Formula and Magnification
New Cartesian sign convention, mirror formula, focal length, radius of curvature and magnification.
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Topic 3.3
Refraction and Refractive Index
Laws of refraction, bending of light, refractive index, glass slab and apparent depth reasoning.
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Topic 3.4
Spherical Lenses and Power
Convex and concave lenses, lens formula, magnification, power of a lens and image interpretation.
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Topic 3.5
Human Eye, Prism and Scattering
Human eye, accommodation, myopia, hypermetropia, prism refraction, dispersion and scattering applications.
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