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प्रश्न
The power of a lens is +2.0 D. Find its focal length and state what kind of lens it is.
संख्यात्मक
एक पंक्ति में उत्तर
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उत्तर
Focal length (in metres) = `1/"power(in dioptres)"`
Focal length (in metres) = `1/2` = 0.5m = 50 cm
Since, the focal length is positive, the lens is aconvex lens.
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