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Light

Tamil Nadu Board · Class 9 · Science

Complete topic list for Light in Tamil Nadu Board Class 9 Science. Key concepts, sub-topics, and what to focus on for board exams.

43 questions35 flashcards5 concepts

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Ray diagrams showing image formation by a convex mirror for two object positions: at infinity and at a finite distance from the mirror. Each diagram should clearly show the object, mirror, principal a
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4 Topics · Tamil Nadu Board Class 9 Science

Topics in Light

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.

Key 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 Chapter Overview: Light – Key Concepts Mind Map, Light - Complete Concept Overview, Light: Comprehensive Concept Map. These are the concepts Tamil Nadu Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Light — Tamil Nadu Board Class 9 Science?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and 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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All 10 chapters — Tamil Nadu Board Class 9 Science Syllabus

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