The red light used instead of blue light ,then focal length is
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Focal length of a lens varies linearly with wavelength of light used. This is what leads to chromatic dispersion! Since violet light has a shorter wavelength compared to red light, focal length of a lens will decrease if red light is replaced by violet light.
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The refractive index of the material of a lens increases with the decrease in wavelength of the incident light. ... Thus, when we replace red light with a blue wavelength decrease and hence the focal length of the lens also decrease
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