यदि वास्तविक प्रतिबिंब का आकार बिंब के आकार का बनता है और दर्पण से 18 सेंटीमीटर की दूरी पर बनता है तो बताएं उसकी फोकस दूरी क्या है
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hey buddy
You can get an idea from this picture because I think something is missing there in this question.
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