In this lecture, Ashish Sir explains important NCERT solved examples (2.2, 2.3, and 2.4) from Chapter 2 – Units and Measurements for Class 11 Physics. This session is highly useful for students preparing for IIT JEE Mains, NEET, and CBSEState Board exams.br br 🔹 Key Topics Covered:br br 1. Parallax Method (NCERT Example 2.2)br br -Explanation of the parallax principle and how it helps in measuring large distances that cannot be directly measured.br br -Step-by-step solving of Example 2.2 with proper reasoning.br br -Applications of the parallax method in astronomy and physics experiments.br br 2. Range of Lengths & Measurement of Length (NCERT Example 2.3)br br -Discussion of the range of measurable lengths in physics – from the size of subatomic particles to astronomical distances.br br -Methods of measuring small lengths (e.g., screw gauge, vernier calipers, optical instruments).br br -Solving Example 2.3 with conceptual clarity to show practical applications of these methods.br br 3. Measurement of Mass & Time (NCERT Example 2.4)br br -Explanation of how mass is measured in laboratories and advanced experiments.br br -Time measurement using oscillations, atomic clocks, and precision instruments.br br -Solving Example 2.4 with proper units and detailed calculations.br br 🔹 Concepts Highlighted by Ashish Sir:br br -Importance of significant figures and units while solving problems.br br -Practical techniques used in physics for measuring quantities accurately.br br -The bridge between theoretical understanding and real-life applications of measurements.br br This lecture ensures that students not only learn the step-by-step solutions of NCERT examples but also gain a deeper understanding of how measurements form the foundation of experimental physics.