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in Physics by (121k points)
एक खगोलीय दूरदर्शक (astronomical telescope) में 60 Cm फोकस-दूरी का अभिदृश्यक और 5 cm फोकस-दूरी की नेत्रिका है | इससे बहुत दूर स्थित एक वस्तु को इस प्रकार देखा जाता है कि किरणे नेत्रिका से अपवर्तन के बाद समांतर हो जाती है | यदि अभिदृश्यक पर वस्तु द्वारा बना कोण `2^(@)` हो, तो प्रतिबिम्ब की कोणीय चौड़ाई है
A. `10^(@)`
B. `24^(@)`
C. `1//6^(@)`
D. `50^(@)`

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