If convex lens of focal length 80cm and a concave lens of focal length – McqOptions

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1.	If convex lens of focal length 80cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power [AFMC 2002]
A.	+ 6.5 D
B.	? 6.5 D
C.	+ 7.5 D
D.	? 0.75 D
Answer» E.

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