A convex lens of focal length 40 cm is in contact with a concave lens – McqOptions

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1.	A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is [IIT-JEE 1982; AFMC 1997; CBSE PMT 2000; RPMT 2003]
A.	- 1.5 D
B.	- 6.5 D
C.	+ 6.5 D
D.	+ 6.67 D
Answer» B. - 6.5 D

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