A glass prism is immersed in a hypothetical liquid. The curves showing the refractive index n as a function of wavelength λ for glass and liquid are as shown in the figure. A ray of white light is incident on the prism parallel to the base. Choose the incorrect statement -
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a
yellow ray travels without deviation
b
blue ray is deviated towards the vertex
c
red ray is deviated towards the base
d
there is no dispersion
answer is D.
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Detailed Solution
n for liquid =n for glass for yellow light ∴ yellow light travels without deviation. But n for liquid n for glass (blue light)∴ deviated towards vertex.