Question
Fri May 30, 2008 By:

A compound lens is made up of two lens in contact having powers +12.5D and -2.5D.One object is place

Expert Reply
Wed July 16, 2008

use the formula  P = P1 + P2 , this will give you combined power

 P = 1/ f

now use the formula 1/f = 1/v - 1/u

use the above two formula considering sign convention.

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