what do you mean by power of lens? A lens has a power of -2D. state the nature of the lens and calculate its focal length
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The reciprocal of focal length is called power
p=1/f therefore f is 1/-2 ie -0.5
The nature of lens is concave lens
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power of a lens is the reciprocal of focal length.The focal length is 1/-2= -0.5 m.the lens is concave.
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