7- In Convexo-Concave lens….
A. One surface of a lens is convex, and another surface is concave
B. Both surfaces of a lens are convex
C. Both surfaces of a lens are concave
D. One surface is convex and the other is plane
Answer:A
7- In Convexo-Concave lens….
A. One surface of a lens is convex, and another surface is concave B. Both surfaces of a lens are convex C. Both surfaces of a lens are concave D. One surface is convex and the other is plane