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Why is focal length of light of yellow colour taken as geometric mean of focal length of light of red and violet colours when a ray of white light passes through a lens?

Why is focal length of light of yellow colour taken as geometric mean of focal length of light of red and violet colours when a ray of white light passes through a lens?

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1 Answers

Aziz Alam IIT Roorkee
askIITians Faculty 233 Points
7 years ago
PLease look into the solution.

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