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     EduGorilla 
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    Two thin equiconvex lenses, each of focal length 0.2 m, are placed coaxially with their optic centres 0.5 m apart. What is the focal length of the combination?

    Options :-

    1. -0.4 m
    2. 0.4 m
    3. -0.1 m
    4. 0.1 m
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