A glass prism is immersed in a hypothetical liquid. The curves showing the refractive index n as a function of wavelenght `lambda` for glass and liquid are as shown in Figs. When a ray of white light is incident on the prism parallel to the base

Options

A. yellow ray travels without deviation
B. blue ray is deviated toward the vertex
C. re ray is deviated towar the base
D. there is no dispersion

Answer

a., b., c.

Explanation

n forliquid `=n` for glass `//` yellow light
but n for liquid `lt` n for glass (red light), so it will deviated toward base, for blue light n (liquid) `gt` n (glass) so it will deviate towards vertex