On passing through a prism, a parallel beam of white light splits into lights of seven colours. ...

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On passing through a prism, a parallel beam of white light splits into lights of seven colours. Take a combination of two identical prisms as shown below. A parallel beam of white light is incident on the face \( \mathrm{AD} \). The emergent light from the face \( \mathrm{BC} \), consists of
a. a parallel beam of light of several colours
b. a divergent beam of lights of several colours
c. a parallel beam of white light
d. a divergent beam of white light.
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