Respuesta :
there are two types
1) plano convex
2)doule convex
so the answer is-----(c)
1) plano convex
2)doule convex
so the answer is-----(c)
a. plano-convex
b. plano-concave
c. converging <-------------------
d. double-concave
b. plano-concave
c. converging <-------------------
d. double-concave