Two thin lenses whose powers are +2D and -4D respectively combine, the – McqOptions

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1.	Two thin lenses whose powers are +2D and -4D respectively combine, then the power of combination is [AFMC 1998; CPMT 1996; Very Similar to BHU 2004]
A.	- 2D
B.	+ 2D
C.	- 4D
D.	+ 4D
Answer» B. + 2D

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