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Ray Optics and Optical Instruments — Revision Notes

J&K CET · Physics

Free Ray Optics and Optical Instruments revision notes for J&K CET Physics 2026 — key concepts, formulas, and definitions for quick revision.

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Revision Notes — Ray Optics and Optical Instruments

Key concepts, formulas, and definitions from Ray Optics and Optical Instruments for J&K CET Physics preparation.

Key Topics to Revise

1

Reflection of Light by Spherical Mirrors

  • Light follows two fundamental laws of reflection: angle of incidence equals angle of reflection, and incident ray, reflected ray, and normal lie in same plane
  • Spherical mirrors are parts of hollow spheres - concave (converging) and convex (diverging)
  • For spherical mirrors, focal length f = R/2, where R is radius of curvature
2

Refraction of Light

  • Refraction occurs when light passes from one medium to another due to change in speed
  • Snell's law: μ₁sin i = μ₂sin r, where μ is refractive index
  • Refractive index μ = c/v = speed of light in vacuum/speed in medium
3

Refraction at Spherical Surfaces and Thin Lenses

  • Refraction at spherical surface: μ₂/v - μ₁/u = (μ₂-μ₁)/R
  • Lens maker's formula: 1/f = (μ-1)(1/R₁ - 1/R₂)
  • Thin lens formula: 1/v - 1/u = 1/f (similar to mirror formula but different sign)
4

Refraction Through Prism

  • Prism: triangular piece of transparent material with refracting angle A
  • Deviation δ = i + e - A, where i=incident angle, e=emergent angle
  • At minimum deviation: i = e, and ray inside prism parallel to base

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Key Concepts

Two fundamental laws govern reflectionWhen light passes from one mediumOccurs when light travels from denserFor thin lensesFor prism

Frequently Asked Questions

What topics are covered in Ray Optics and Optical Instruments for J&K CET?
Ray Optics and Optical Instruments is an important chapter in J&K CET Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Reflection of Light by Spherical Mirrors, Refraction of Light, Refraction at Spherical Surfaces and Thin Lenses, Refraction Through Prism.
How important is Ray Optics and Optical Instruments for J&K CET?
Ray Optics and Optical Instruments is a frequently tested chapter in J&K CET Physics. Questions from this chapter appear regularly in previous year papers. There are 353 practice questions available for this chapter.
How to prepare Ray Optics and Optical Instruments for J&K CET?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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