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Question
10 cm এবং 30 cm ফোকাস দুরত্বের দুটি উত্তল লেন্স পরস্পর জুড়ে দিলে উহাদের তুল্যে ফোকাস দূরত্ব কত?
7.5 cm
-7.5 cm
0.13 cm
-0.13 cm
ANSWER : 1
Descrption
<p>Let, f<sub>1</sub> = 10 cm</p><p>f<sub>2</sub> = 30 cm</p><p>F = ?</p><p>We know,</p><p> <math class="wrs_chemistry" xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><msub><mi>f</mi><mn>1</mn></msub></mfrac><mo>+</mo><mfrac><mn>1</mn><msub><mi>f</mi><mn>2</mn></msub></mfrac><mo>=</mo><mfrac><mn>1</mn><mi>F</mi></mfrac><mspace linebreak="newline"> </mspace><mfrac><mn>1</mn><mn>10</mn></mfrac><mo>+</mo><mfrac><mn>1</mn><mn>30</mn></mfrac><mo>=</mo><mfrac><mn>1</mn><mi>F</mi></mfrac></math> </p><p>=><strong> F</strong> = 7.5 cm</p>
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