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प्रश्न
The power of a lens is - 5D.
1) Find its focal length.
2) Name the type of lens.
उत्तर
1) Given the power of lens - -5D
focal length (f)
`f = 1/d = 1/(-5) = (-1)/5 = -0.2 m`
2) As power is negative lens is concave.
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