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     EduGorilla 
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    Two convex lenses are placed in combination at a distance of 20 m. Find the focal length of one of the lens, if the focal length of one lens is 6 cm, the power of one lens is 0.083 D and the power of the other lens is 0.125 D such that the ratio of total power of combination to the total focal length of combination is 4 : 8.

    Options :-

    1. 16 m
    2. 13.5 m
    3. 12 m
    4. 17.5 m
    5. None of the above
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