An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is
A. Convergent of crown and divergent of flint
B. Divergent of crown and convergent of flint
C. Both divergent
D. Both convergent

An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

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