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प्रश्न
Power of a lens is – 4D, then its focal length is
विकल्प
4m
–40m
–0.25 m
–2.5 m
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उत्तर
– 0.25 m
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संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2.5 D.
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