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प्रश्न
How is the power of a lens related to its focal length?
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उत्तर
Power of lens (in D) = `1/"focal lenght (in metre)"`
1 diopter = `1/"focal lenght (in metre)"`
Or D = `(100 "cm")/"Focal length"`
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संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2.5 D.
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Define the term focal length of a lens.
How does the power of a lens change if its focal length is doubled?
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Name the type of lens whose power is positive.
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