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सरल सूक्ष्मदर्शी के उत्तल लेंस की फोकस दूरी 5 सेमी है। यदि स्पष्ट दृष्टि की न्यूनतम दूरी 25 सेमी हो, तो सरल सूक्ष्मदर्शी की आवर्धन-क्षमता ज्ञात कीजिए।

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सूत्र - `m=1+D/f`
दिया है : D=25 सेमी तथा f=5 सेमी
सूत्र में मान रखने पर, `m=1+25/5=6`

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