Hindi, asked by v84768830, 9 months ago

21. एक गोलीय दर्पण की वक्रता-त्रिज्या 20 cm है। इसकी
फोकस-दूरी कितनी होगी?

Answers

Answered by tubaf555

1

Answer:

10cm

Explanation:

f=R÷2 or R=2f..........

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