CBSE 12 Physics · U6
Optics
CBSE Class 12 Physics Unit VI: ray optics, mirrors, refraction, lenses, optical power, prisms, total internal reflection, optical instruments, Huygens' principle, interference, Young's double-slit experiment, and single-slit diffraction.
Test yourself
A focused, distraction-free run through 27 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 6.1
Reflection and Refraction
Plane mirrors, mirror formula, Snell's law, apparent depth, and refraction at spherical surfaces
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Topic 6.2
Lenses and Optical Power
Thin lens formula, lens maker's formula, magnification, power, combinations, and common eye-defect correction
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Topic 6.3
Prism, Dispersion and Total Internal Reflection
Prism minimum deviation, dispersion, critical angle, total internal reflection, lateral shift, and optical fibres
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Topic 6.4
Optical Instruments
Simple microscope, compound microscope, refracting and reflecting astronomical telescopes, normal adjustment, brightness and magnification
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Topic 6.5
Wave Optics
Huygens' principle, coherent sources, Young's double-slit experiment, fringe width, and qualitative single-slit diffraction
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