A. Convex lens
B. Concave lens
C. Concave-convex
D. None of the Above
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The raw material used for the manufacture of the Glass and is cement is :
A Clay B Gypsum C Washing soda D Limestone
A. Convex lens
B. Concave lens
C. Concave-convex
D. None of the Above
A Clay B Gypsum C Washing soda D Limestone