Question

द रेडियस ऑफ कर गई चुल ऑफ कॉन्वेक्स मिरर स्टोन 20 सेंटीमीटर फाइंड इट्स फोकल लेंथ

Answer 1

please write in English then I can answer

Answer 2

for a concave mirror or a convex mirror the centre of curvature is twice the focal length also the distance of centre of curvature from the pole is the radius therefore the is twice the focal length

Thanks!

By the way if you find my answers helpful please upvote as it gives the author motivation to create more content and answers.