29. An achromatic combination of lenses is formed by joining ?

29. An achromatic combination of lenses is formed by joining ?


(a) 2 convex lenses

(b) 2 concave lenses

(c) 1 convex and 1 concave lens

(d) 1 convex and 1 plane mirror


Answer :  (c) 1 convex and 1 concave lens











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