What is meant by power of lens? Write its si unite. A student uses lens of focal length 40cm and another of -20cm. Write the nature and power of each lens?

What is meant by power of lens? Write its si unite. A student uses len

1.	What is meant by power of lens? Write its si unite. A student uses lens of focal length 40cm and another of -20cm. Write the nature and power of each lens?
Answer» f lens ids DEFINED as the RECIPROCAL of focal length in metre. SI UNIT is diophtreD

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What is meant by power of lens? Write its si unite. A student uses lens of focal length 40cm and another of -20cm. Write the nature and power of each lens?

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