How does the focal length of convex lens changes with increase in wavelength of incident light?
Answers
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inversely with refractive index, its also varies inversely with the wavelength .
Focal length increases with wavelength and decreases with refractive index .
As we all know that Cuachy's equation gives relationship between refractive
index and wavelength of light for a particular transparent material and again
lens formula gives a relationship between focal length and refractive index, so
eliminating refractive index term from both equation should give you a
mathematical relation between the wavelength and the focal distance.
n(λ) = B + C/λ²
Here B and C are coefficient determined for the material .
Hope it helps
Answer:
The focal length of a convex lens increases as the wavelength increases. This is so because the refractive index decreases with an increase in wavelength of light.