An achromatic combination of lenses is formed by joining
A. 2 convex lens
B. 1 convex, 1 concave lens
C. 2 concave lenses
D. 1 convex and 1 plane mirror
Answer:B
An achromatic combination of lenses is formed by joining
A. 2 convex lens B. 1 convex, 1 concave lens C. 2 concave lenses D. 1 convex and 1 plane mirror