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An achromatic combination of lenses is formed by joining

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An achromatic combination of lenses is formed by joining

(a) 2 convex lens 

(b) 1 convex, 1 concave lens 

(c) 2 concave lenses 

(d) 1 convex and 1 plane mirror

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1 Answer

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(b) 1 convex, 1 concave lens

An achromatic doublet should satisfy the condition \(\frac{w_1}{f_1}\) + \(\frac{w_2}{f_2}\) = 0.

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