(b) An achromatic doublet of focal length 20 cm is made of different kinds of glass shown below. Find the focal length of each lens, stating whether it is convergent or 15| divergent. Type of glass Туре 1 Туре II Туре Ш Holue 1.527 Pred 1.515 1.634 1.617 1.725 1.718 An achromatic doublet of focal length 20 cm is made of different kinds of glass shown below. Find the focal length of each lens, stating whether it is convergent or divergent.

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