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प्रश्न
The focal length of a lens is +150 mm. What kind of lens is it and what is its power?
संख्यात्मक
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उत्तर
Power of a lens is given by:
Power (P) `=1/f`
`p='1/(150xx10^-3)=6.67 D`
Since the power is positive, the lens is convex in nature.
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