this is the middle of this center of this mirror is the it's called pole and this C is the radius of the or center of the curvature with the center of the curvature see or is the part of its sphere is the part of sphere.
यहां इस दर्पण का केंद्र है इसे धुरी कहते हैं और यहां C त्रिज्या है या वक्रता का केंद्र है या गोले का हिस्सा है।