The focal length and power of the combination of convex and concave le – McqOptions

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1.	The focal length and power of the combination of convex and concave lens of same focal lenght placed in contact with each other?
A.	half the focal length,twice the power of single lens
B.	zero,infinite
C.	infinite,zero
D.	twice the focal lenght of single lens and half the power of single lens
Answer» D. twice the focal lenght of single lens and half the power of single lens

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