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Light - Reflection and Refraction
This chapter builds the foundation of geometrical optics by showing how light reflects from mirrors and refracts through different media. Students should learn the ray rules, sign conventions, and standard image cases because most CBSE questions come from diagrams and numericals.
Difficulty
Medium
Study time
80-100 min
Plan by time
Pick the window that matches what you have right now.
If you have 15 min
Last-pass revision
Skim the Quick Revision table — definitions, formulas, and the traps board examiners reuse.
Open Quick RevisionIf you have 45 min
Targeted practice
Read the high-priority concepts, then take the chapter MCQ quiz to find weak spots.
Start MCQ QuizIf you have 80 min
First full pass
Walk every concept in chapter order, then revise and quiz. Best for the first time you study this chapter.
Open Key ConceptsChapter Learning Map
Start with one of the buckets below, then open the full map when you want the complete concept roadmap.
Key Concepts
Concepts grouped the way the chapter is taught — open the bucket that matches what you want to revise.
Core Concepts
high priorityOpen the chapter concepts in a clean revision order.
Reflection
Reflection is the bouncing back of light into the same medium after it strikes a surface.
Laws Of Reflection
The laws of reflection state that the incident ray, reflected ray, and normal lie in one plane, and angle of incidence equals angle of reflection.
Spherical Mirror
A spherical mirror is a mirror whose reflecting surface forms part of a sphere.
Focal Length
The focal length is the distance between the pole of a mirror and its principal focus.
Mirror Formula
The mirror formula relates object distance, image distance, and focal length for spherical mirrors.
Refraction
Refraction is the bending of light when it passes from one medium to another because its speed changes.
Refractive Index
Refractive index tells us how much a medium slows down light compared with vacuum or air, and how strongly it bends light.
Lens Formula
The lens formula relates object distance, image distance, and focal length for a thin lens.
Power Of Lens
Power of a lens is the measure of how strongly it converges or diverges light.
Image By Convex Lens
A convex lens can form real or virtual images depending on where the object is placed.
Exam Intelligence
Use this section to decide what deserves the most revision time.
High Probability Topics
- Reflection
- Laws Of Reflection
- Spherical Mirror
- Focal Length
- Mirror Formula
- Refraction
- Refractive Index
- Lens Formula
Common Traps
- Measuring angles from the mirror surface instead of the normal.
- Forgetting the Cartesian sign convention in mirror and lens numericals.
- Using centimetres directly in lens power calculations.
- Confusing concave and convex mirrors by shape only.
- Assuming every convex lens image is real.
Likely Question Types
- MCQ: concept checks, applications, and common mistakes
- Very short answer: definitions, formulas, or conditions
- Short answer: worked method, example, or reason-based explanation
- Case-based: chapter scenario with concept-linked subparts
Quick Revision
Concept, formula or equation to remember, and the trap that loses marks — in one scannable view.
- Reflection keeps light in the same medium.
- Laws of reflection use the normal as reference.
- Spherical mirrors and lenses create images depending on object position.
- Refraction bends light because its speed changes in a new medium.
- Formulas are useful only when signs and units are correct.
- Reflection: Reflection is the bouncing back of light into the same medium after it strikes a surface.
- Laws Of Reflection: The laws of reflection state that the incident ray, reflected ray, and normal lie in one plane, and angle of incidence equals angle of refl…
- Spherical Mirror: A spherical mirror is a mirror whose reflecting surface forms part of a sphere.
Practice
Use short concept checks first, then move into the full chapter test.
Free Chapter MCQ Quiz
Try a 15-question quiz from this chapter. Get instant score and unlock concept-wise analytics.
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