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एक दूरदर्शी के अभिदृश्यक लेंस की फोकस - दूरी 1.00 मीटर है । जब अंतिम प्रतिबिम्ब स्पष्ट दृष्टि की न्यूनतम दूरी पर बनता है , तो लेंसों के बीच की दूरी 1.05 मीटर होती है नेत्रिका लेंस की फोकस - दूरी तथा दूरदर्शी की आवर्धन क्षमता ज्ञात कीजिए ।

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`f_(0)+u_(e)=1.05"मी "rArr1.0+u_(e)=1.05`
`rArr" "u_(e)=0.05"मी "=5"सेमी "`
`(1)/(v_(e))-(1)/(u_(e))=(1)/(f_(e))`
`-(1)/(25)-(1)/(-5)=(1)/(f_(e))rArrf_(e)=(25)/(4)=6.25` सेमी |
आवर्धन क्षमता `M=-(f_(o))/(f_(e))(1+(f_(e))/(D))`
`=-(105)/(25//4)(1+(25//4)/(25))=-21`.

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