A lens has a power of –2.5 D. What is the focal length and nature of the lens?
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Answered by
8
Answer:
Given,
Power of lens, P = - 2.5 D
Therefore,
Focal length,
straight f space equals space 1 over straight P equals space fraction numerator 1 over denominator negative 2.5 end fraction straight m space equals space minus 40 space cm.
The negative sign of focal length indicates that the lens is concave.
Answered by
5
Answer:
the focal length of the lens is -0.4m.The nature of the lens is concave
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