Physics
An narrow beam of white light is incident on three glass objects as shown below. Comment on the nature of behaviour of the emergent beam in all three cases.
Answer
(a) The incident beam of light after refraction though glass slab emerges out parallel to the incident beam but laterally shifted. No dispersion takes place in this case.
(b) When the beam of light passes through the first prism, it splits into its seven constituent colours, however, these seven colours on passing through the second inverted prisms recombine. The emergent ray is parallel to the incident beam but slightly shifted outwards.
(c) When the incident beam passes through the prism, it splits into its constituent colours. These split further on emerging out of the prism and dispersion pattern is observed.
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