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The equation omega=(muv-mur)/(mu-1) was ...

The equation `omega=(mu_v-mu_r)/(mu-1)` was derived for a prism having small refracting angle. Is it also valid for a prism of large refracting angle? Is it also valid for a glass slab or a glass sphere?

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Can the dispersive power omega = (mu_v-mu_r)/(mu-1) be negative? What is the sign of omega if a hollow prism is immersed into water?

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Knowledge Check

  • The angle of incident at which reflected light is totally polarised for reflection from air to glass (refractive index mu ) is

    A
    `sin^(-1) (mu)`
    B
    `sin^(-1)((1)/(mu))`
    C
    `tan^(-1)((1)/(mu))`
    D
    `tan^(-1)(mu)`

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