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A glass prism produces a spectrum when w...

A glass prism produces a spectrum when white light passes through it but a glass slab does not do so. Explain.

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In a glass slab, both the refracting faces are parallel. Dispersion produced by one face is cancelled by the other face and hence no spectrum is produced. In prism, the two refracting faces are not parallel to each other and hence, dispersion produced at the two faces gets added up producing a spectrum.
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Knowledge Check

  • A glass prism is immersed in water. A ray of light passing through it,

    A
    Bends away from the base
    B
    Does not bend
    C
    Bends towards the base
    D
    Always gets totally reflected

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    A
    Refracted
    B
    Passes straight
    C
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    D
    None of the above

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