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If two lenses of `+5` dioptres are mounted at some distance apart, the equivalent power will always be negative if the distance is

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If two lenses of `+5` dioptres are mounted at some distance apart, the equivalent power will always be negative if the distance is
A. Greater than 40 cm
B. Equal to 40 cm
C. Equal to 10 cm
D. Less than 10 cm
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by (121k points)
Correct Answer - a
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