Chapter 6 of 10
Revision Notes
Light — Revision Notes
Tamil Nadu Board · Class 9 · Science
Light revision notes for Tamil Nadu Board Class 9 Science: 4 topics in quick points. Part of the Tamil Nadu Board Class 9 Science syllabus.
43 questions35 flashcards5 concepts
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Key Topics to Revise
1
Reflection of Light and Laws of Reflection
- Light falling on a polished surface (like a mirror) bounces back — this is called reflection.
- The ray falling on the mirror is called the Incident Ray.
- The ray bouncing back is called the Reflected Ray.
2
Real and Virtual Images
- A Real Image is formed when light rays actually meet after reflection. It is always inverted and can be projected on a screen.
- A Virtual Image is formed when light rays do not actually meet but appear to meet when extended backwards. It is always erect and CANNOT be projected on a screen.
- Concave mirrors can form both real and virtual images depending on the position of the object.
3
Spherical Mirrors – Key Terms and Concepts
- A Spherical Mirror is a mirror whose reflecting surface is part of a hollow sphere.
- Concave Mirror: Reflecting surface curves inward (like a cave). Also called a converging mirror.
- Convex Mirror: Reflecting surface curves outward. Also called a diverging mirror.
4
Rules for Ray Diagrams and Image Formation in Concave Mirror
- Rule 1: A ray passing through the Centre of Curvature (C) is reflected back along the same path.
- Rule 2: A ray parallel to the Principal Axis, after reflection, passes through the Principal Focus F (for concave mirror) or appears to come from F (for convex mirror).
- Rule 3: A ray passing through the Principal Focus F gets reflected parallel to the Principal Axis.
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Full NotesKey Concepts
Light follows two fundamental laws whenA plane mirror is a flatReal images form when light raysA concave mirror has a reflectingA convex mirror has a reflecting
Frequently Asked Questions
What are the important topics in Light for Tamil Nadu Board Class 9 Science?
Key topics in Light include Reflection of Light and Laws of Reflection, Real and Virtual Images, Spherical Mirrors – Key Terms and Concepts, Rules for Ray Diagrams and Image Formation in Concave Mirror. Study these first, then practise questions on each for Class 9 exams.
How should I revise Light for Class 9 exams?
Learn the core ideas first, then work through the 43 practice questions on Light. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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