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Last Updated: Mar 15, 2026

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CLASS 10

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Light: Reflection and Refraction Class 10 Notes - PDF & Key Formulas

Comprehensive Class 10 Physics notes on Light: Reflection and Refraction. Master all key concepts including spherical mirrors, lens formulas, and Snell's Law with easy-to-follow ray diagrams and magnification rules. Designed for quick revision, these notes simplify complex optics topics to help you ace your board exams with confidence. Read more >
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1. Reflection of Light

Reflection is the phenomenon of bouncing back of light rays when they strike a polished surface (like a mirror).

Laws of Reflection

[Image of the laws of reflection of light]

  • The angle of incidence is always equal to the angle of reflection (∠i = ∠r).
  • The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.

Spherical Mirrors

Concave Mirror: Curving inwards. Acts as a converging mirror.
Convex Mirror: Curving outwards. Acts as a diverging mirror.
Key Terms:
  • Center of Curvature (C): The center of the hollow sphere of which the mirror is a part.
  • Principal Focus (F): The point where parallel rays meet (or appear to meet) after reflection.
  • Relationship: R = 2f (Radius of curvature is twice the focal length).

2. Mirror Formula & Magnification

These formulas are essential for solving numerical problems in the Class 10 boards.

Mirror Formula1/v + 1/u = 1/f

(v = image distance, u = object distance, f = focal length)

Magnification (m)m = h'/h = -v/u
m is Negative: Image is Real and Inverted.
m is Positive: Image is Virtual and Erect.

3. Refraction of Light

The bending of light when it passes from one transparent medium to another due to a change in its speed.

Laws of Refraction (Snell’s Law)

  • The incident ray, the refracted ray, and the normal all lie in the same plane.
  • The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant:
Snell's Lawsin i / sin r = constant (n)

Refractive Index (n)

Represents how much light slows down in a medium.

nтВВтВБ = Speed of light in medium 1 / Speed of light in medium 2

4. Lenses

Lenses work on the principle of refraction.

[Image of ray diagrams for convex and concave lenses]

Convex Lens: Thick at center, thin at edges. (Converging)
Concave Lens: Thin at center, thick at edges. (Diverging)
Lens Formula1/v - 1/u = 1/f
Power of a Lens (P)P = 1 / f (in meters)
  • Unit: Dioptre (D).
  • Convex lens power: Positive (+)
  • Concave lens power: Negative (-)
QUICK REVISION
  • Sign Convention: Object distance (u) is always negative.
  • Nature: Real images = Inverted | Virtual images = Erect.
  • High Weightage: Practice all 6 cases of image formation for concave mirrors and convex lenses!
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Physics Class 10 Science Light Reflection Refraction CBSE NCERT Board Exams Study Material Handwritten Notes Optics Mirror Formula Lens Formula Ray Diagrams Revision Tips Science Notes Education Chapter 10 Exam Preparation

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