Ray optics

Currently Playing: Worked example: Total internal reflection | Ray optics | Physics | Khan Academy

In this video, we solve a question on Snell's window and also deal with refraction and TIR across 3 mediums! 00:06 1st Question 00:51 Drawing all the light rays from the source 02:38 How do the light rays look when they are incident at critical angle? 03:01 Using Snell's law to calculate the critical angle 03:59 Relating critical angle with the angle subtended at the source 04:55 2nd Question 05:48 Comparing the refractive indices of the three mediums 07:43 Using Snell's law to relate the refractive indices of medium A and B Practice this concept - https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-and-plane-surfaces/e/total-internal-reflection Master the concept of Refraction at plane surfaces through practice exercises and videos - https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments/in-in-refraction-and-plane-surfaces/v/refraction-and-snell-s-law Check out more videos and exercises on Ray optics and Optical instruments - https://www.khanacademy.org/science/in-in-class-12th-physics-india/in-in-ray-optics-and-optical-instruments To get you fully ready for your exam and help you fall in love with Physics, find the complete bank of exercises and videos for Class 12 Physics here - https://www.khanacademy.org/science/in-in-class-12th-physics-india Khan Academy is a free learning platform for Class 1-12 students with videos, exercises, and tests for maths, science, and more subjects. Our content is aligned to CBSE syllabus and available in Hindi, English, and many more regional languages. Experience the joy of easy, seamless, accessible learning anywhere, anytime with Khan Academy. Subscribe to our YouTube channel - https://www.youtube.com/c/khanacademy As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Vibhor Pandey