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একটি দূরবীক্ষণ যন্ত্রের সর্বনিম্ন বিবর্ধন ক্ষমতা M, যদি নলের ফোকাস দূরত্ব দ্বিগুণ করা হয়, তবে বিবর্ধন ক্ষমতা হবে-

1. A 2 M
2. B 3 M
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4. D <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" role="presentation" tabindex="0" ctxtmenu_counter="37" style="font-size: 114.2%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-msqrt><mj