How does focal length of a lens change when red light is replaced by blue light
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Hey !!
We know,
1/f = (μ-1) (1/R₁ - 1/R₂)
f ∝ 1 / (μ-1) and μ₀ > μr
The increasing in refractive index would result in decrease of focal length of lens. Hence, we can say by replacing red light with violet light, decreases the focal length of the lens used.
Good luck !!
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