Pick up the correct statement from the following :

Question:
Pick up the correct statement from the following :

1.the power of a lens is the reciprocal of its focal length

2. the unit of power of the lens is diopter

3.the power of two or more thin lenses in contact is the power of the combination of the lenses

4.all the above.

Posted Date:-2021-03-26 00:54:39


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