A common type of bi-focal lens described in the chapter has which arrangement?
Question
A common type of bi-focal lens described in the chapter has which arrangement?
Concave lens on top (distant vision), convex lens below (near vision)
Convex lens on top, concave lens below
Both portions are concave
Both portions are convex
Answer
Concave lens on top (distant vision), convex lens below (near vision)
Detailed Explanation
The chapter states that in a common bi-focal lens, the upper portion is a concave lens (for distant vision) and the lower part is a convex lens (for near vision).