Express the combined power of two lenses, one of focallength +f_(1) and of the other-f_(2) in contact with each other.

Express the combined power of two lenses, one of focallength +f_(1) an

1.	Express the combined power of two lenses, one of focallength +f_(1) and of the other-f_(2) in contact with each other.
Answer» <P> Solution :`(1)/(F)=(1)/(f_(1))+(1)/(-f_(2))` where .f. is in metre. i.e., `P=(P_(1)-P_(2))` and .P. is in DIOPTRE.

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Express the combined power of two lenses, one of focallength +f_(1) and of the other-f_(2) in contact with each other.

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