The power of the lens is 2.5D. What is the nature and focal lenght of – McqOptions

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1.	The power of the lens is 2.5D. What is the nature and focal lenght of the lens?
A.	Concave,20 cm
B.	Convex,20 cm
C.	Concave,40 cm
D.	Convex,40 cm
Answer» E.

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