Sign Convention Hack: Never Get (+/-) Wrong Again! (Class 10 Mirrors) | Class 10 | NCERT

Confused about when to take 'u', 'v', or 'f' as positive or negative? One wrong sign can kill your entire numerical! 🛑 In this video, I break down the Cartesian Sign Convention for Spherical Mirrors (Concave & Convex) using a simple "Graph Trick." Stop memorizing tables and start understanding the logic. We also cover the Mirror Formula and the Magnification Formula so you are 100% ready for the next video (Solving PYQs!). [Image of cartesian sign convention for spherical mirrors] ➡️ Get FREE PDF Notes (Sign Convention Cheat Sheet) in our Telegram: https://t.me/PixelPhysics --- This is Video 1.3 of the 'Pixel Physics: Chapter 1 - Light' playlist. PREVIOUS VIDEOS: Video 1.1: Master Ray Diagrams (The Rules) [Link to Video 1.1] Video 1.2: The 8 Important Ray Diagrams [Link to Video 1.2] NEXT VIDEO (The Grand Finale): Video 1.4: Solving a Mirror PYQ with Python (Visualized!) --- TIMESTAMPS: 0:00 - The "+ or -" Confusion (Why you lose marks) 0:45 - The "Graph Trick" (Cartesian Sign Convention) 2:00 - Concave vs. Convex Mirror (Focal Length Signs) 3:30 - The Mirror Formula (1/v + 1/u = 1/f) 5:00 - Magnification Formula (m = -v/u) - Watch out for the MINUS! 6:15 - Real vs. Virtual Images (Using 'm') 7:00 - Download the Cheat Sheet (Telegram)