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in Physics by (82.5k points)
n अपवर्तनांक वाले गोलिये अवतल पृष्ठ की प्रथम एवं द्वितीय फोकस दूरियां क्रमश: `f_(1)` तथा `f_(2)` है! इसके मध्य सम्बन्ध होगा-
A. `f_(2)=f_(1)`
B. `f_(2)=f_(1)`
C. `f_(2)=nf_(1)`
D. `f_(2)=-nf_(1)`.

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