# NCERT Solutions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments

NCERT solutions for class 12 Physics chapter 9 Ray Optics and Optical Instruments: Do you know what is a mirage? Have you ever experienced it? The NCERT solutions for class 12 Physics chapter 9 Ray Optics talks about a few natural phenomena due to light such as mirage, also describes laws of refraction and reflection and introduces a few optical instruments. NCERT grade 12 chapter 9 has a higher weight for CBSE board examination. Here our subject matter experts provide NCERT solutions for class 12 Physics chapter 9 Ray Optics and Optical Instruments in detail. This chapter has a high weight as far as competitive exams are considered.

NCERT solutions for class 12 Physics chapter 9 Ray Optics and Optical Instruments: important formulas. The important formulas of NCERT class 12 chapter 9 are listed below. Try to understand those formulas and study their derivation if available in NCERT book.

 Formula Description Mirror equation: v is object distance from the pole of the mirror. u is the image distance from the pole of the mirror. F is the focal length of the mirror which is approximately equal to half the radius of curvature Magnification of a mirror height of the image from the principal axis height of the object from the principal axis If a prism of refractive index n2is placed in a medium of refractive index n1then A is the angle of the prism Dm is the angle of  minimum deviation Thin lens formula   Lens makers formula v, u are image and object distance from the optical centre of the lens and f is the focal length.   refractive index of the medium of the object refractive index of the lens are the radius of curvature of two surface Power of a lens Where P is the power and f is the focal length in meters The magnifying power of a simple microscope For compound microscope magnification m=mem0 D = 25 cm is the least distance of distinct vision and f is the focal length of the convex lens me is magnification due to the eyepiece. mo is magnification produced by objective. For a telescope magnifying power is given by Beta is the angle subtended by eyepiece at the image Alpha is the angle subtended at the eye bu the object

One important concept in NCERT  class 12  chapter 9 Ray Optics is the total internal reflection.

## 9.1 Introduction

9.2 Reflection of Light by Spherical Mirrors

9.2.1 Sign convention

9.2.2 Focal length of spherical mirrors

9.2.3 The mirror equation

9.3 Refraction

9.4 Total Internal Reflection

9.4.1 Total internal reflection in nature and its technological applications

9.5 Refraction at Spherical Surfaces and by Lenses

9.5.1 Refraction at a spherical surface

9.5.2 Refraction by a lens

9.5.3 Power of a lens

9.5.4 Combination of thin lenses in contact

9.6 Refraction through a prism

9.7 Some Natural Phenomena Due to Sunlight

9.7.1 The rainbow

9.7.2 Scattering of light

9.8 Optical Instruments

9.8.1 The microscope

9.8.2 Telescope

Each and every topic of chapter 9 Ray Optics and Optical Instruments are important for exams and there is no scope of skipping any topic.

## NCERT solutions for class 12 Physics chapter 9 Ray Optics and Optical Instruments are explained below:

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## NCERT Solutions for Class 12 Physics- Chapter wise

 Chapter 1 Electric Charges and Fields Chapter 2 Electrostatic Potential and Capacitance Chapter 3 Current Electricity Chapter 4 Moving charges and magnetism Chapter 5 Magnetism and Matter Chapter 6 Electromagnetic Induction Chapter 7 Alternating Current Chapter 8 Electromagnetic Waves Chapter 10 Wave Optics Chapter 11 Dual nature of radiation and matter Chapter 12 Atoms Chapter 13 Nuclei Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits