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     EduGorilla 
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    Two lenses of power – 15D and + 5D are in contact with each other. What is the focal length of the combination?

    Options :-

    1. + 20 cm
    2. + 10 cm
    3. - 20 cm
    4. - 10 cm
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Reply To: Two lenses of power – 15D and + 5D are in contact with each other. What is the focal length of the c….
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