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The focal lengths of two convex lenses of same material are 20 cm & 30 cm.

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The focal lengths of two convex lenses of same material are 20 cm & 30 cm. What should be the separation between them so that they form an achromatic combination? 

a) 25 cm 

b) 30 cm 

c) 40 cm 

d) None 

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1 Answer

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Best answer

Correct Option :-  a) 25 cm

Explanation :-

 d = (f1+f2)/2 = (20+30)/2 = 25 cm 

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