Q 85 Two glasses have dispersive powers in the ratio of 2 : 3 These glasses are used - Physics - Ray Optics And Optical Instruments

Question

Q 85 Two glasses have dispersive powers in the ratio of 2 : 3 These
glasses are used in the manufacture of an achromatic objective of
focal length 20 cm What are the focal lengths of the two lenses of
the objective?

Sanjay Singh · Accepted Answer

Dear student

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Q.85. Two glasses have dispersive powers in the ratio of 2 : 3. These glasses are used in the manufacture of an achromatic objective of focal length 20 cm. What are the focal lengths of the two lenses of the objective?