When an optician prescribes a - 5D lens, what does it mean? – McqOptions

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1.	When an optician prescribes a - 5D lens, what does it mean? [NDA]
A.	Concave lens of 20 cm focal length
B.	Convex lens of 5 cm focal length
C.	Concave lens of 5 cm focal length
D.	Convex lens of 5 cm focal length
Answer» B. Convex lens of 5 cm focal length

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