Скачать или смотреть Focal Length Negative? Here's Why | Concave Mirror Sign Convention

, Why is the focal length of a concave mirror taken as negative?
In this video, we explain sign convention in spherical mirrors and the reason behind negative focal length of concave mirror in a simple, exam-oriented way.
This concept is very important for CBSE Class 10 board exams 2026 and numericals from Light – Reflection and Refraction chapter.

🔹 Topics covered in this video:
• Sign convention for mirrors (New Cartesian Sign Convention)
• Position of focus in concave mirror
• Why focal length becomes negative
• Ray diagram based explanation
• Common mistakes students make
📌 Watch till the end for exam tips & numerical clarity.
🔔 Subscribe to Science World by Tushar Sir for Class 10 Science concepts explained clearly.
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