Refraction of Light💥Total Internal Reflection 🎯Part 2/5 Chapter 9 Ray optics 💥 Class 12 Physics
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CBSE Class 12 Physics
NCERT Chapter 9: Ray Optics & Optical Instruments
Refraction of Light
Laws of Refraction
Refractive Index
Cause of refraction
Principle of reversibility of Light
Refraction through a glass slab
Lateral displacement
Real depth & apparent depth
Total internal reflection
critical angle
Application of TIR Optical fibers
Application of TIR Prism
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Chap 9 part 2 Ray Optics and Optical Instruments
00:00:00 Introduction
00:04:17 Refraction of Light
00:06:54 Laws of Refraction of Light
00:09:58 Refractive index in terms of speed of light
00:12:50 Refractive index in terms of wavelength
00:15:33 Optical density Vs mass density
00:17:00 Numerical
00:21:34 Factors affecting Refractive Index
00:24:23 Cause of Refrection
00:28:20 Physical Significance of Refractive Index
00:32:12 Principle of Reversibility of Light
00:39:13 Refraction through a Rectangular Glass Slab
00:49:49 Expression for Lateral Displacement
00:51:55 Lateral Displacement increasses with
00:53:06 Refraction through a Combination of Media
01:02:14 Real & Apparent Depths
01:15:03 Numerical
01:16:23 Total Internal Reflection
01:22:12 Conditions for total internal reflection
01:22:50 Relation between critical angle and refractive index
01:25:04 Numericals
01:35:51 Application of Total Internal Reflection
01:36:05 Totally Reflecting Prism
01:39:25 Advantages of Totally Reflecting Prism over Plane Mirrors
01:40:59 Optical Fibres
01:45:16 Propagation of Light through an Optical Fibre
01:46:47 Light pipe
01:48:46 Application of Optical Fibres
Refraction:
Refraction is the bending of light as it passes from one medium to another medium of different optical density. It occurs due to the change in the speed of light when it crosses the boundary between two media. The basic principle of refraction is governed by Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media. Mathematically, Snell's law is given by:
n₁ sinθ₁ = n₂ sinθ₂
Total Internal Reflection (TIR):
Total internal reflection is a phenomenon that occurs when light passes from a denser medium to a rarer medium and the angle of incidence exceeds the critical angle. In such a case, instead of refracting, all the incident light is reflected back into the denser medium. This phenomenon can only occur when light travels from a medium with a higher refractive index to a medium with a lower refractive index.
The critical angle (θ_c) is the angle of incidence at which the angle of refraction becomes 90 degrees. It can be calculated using the formula:
θ_c = sin^(-1)(n₂/n₁)