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A natural source of light...

A natural source of light

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Knowledge Check

  • A point source of light is placed at a depth of h below the surface of water of refractive index mu . A floating opaque disc is placed on the surface of water so that light from the source is not visible from the surface. The minimum diameter of the disc is

    A
    `(2h)/((mu^(2) - 1)^(1//2))`
    B
    `2h(mu^(2)-1)^(1//2)`
    C
    `(h)/(2(mu^(2)-1)^(1//2))`
    D
    `h(mu^(2)-1)^(1//2)`

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