calculate the focal length of a lens, if it's power is - 2.5D. Last question , then exam over.
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calculate the focal length of a lens, if it's power is - 2.5D. Last question , then exam over.
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Answer:
Power of lens=1/f=2.5D
f=focal length in metre
2.5=1/f
Hence
f=1/2.5
f=0.4m
Hence focal length is 0.4metre (40cm)
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