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किसी संयुक्त सूक्ष्मदर्शी के अभिदृश्यक से वस्तु 1 सेमी. की दूरी पर रखी है। लेंसों के बीच की दूरी 30 सेमी. तथा बीच में बनने वाला प्रतिबिम्ब नेत्रिका लेंस से 5 सेमी. दूरी पर है। आवर्धन क्षमता ज्ञात कीजिये।

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सूत्र - `m=(-v_o)/(u_o).D/u_e`
दिया है - `u_e`=-5 समी ., L=30 समी ., `u_o` -1 समी
`therefore L=v_o +|u_e|` से , `v_o=L-|u_e|=30-5=25 ` सेमी.
सूत्र में मान रखने पर , `m=-v_o/u_o D/u_e=-25/1xx25/5`
=-125

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