Is it true that a spectrum of colours appears when the light passes through a flat pane of glass?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
A spectrum of colours does not appear when light passes through a flat pane of glass because the refracted light emerges out of the glass pane without any deviation. It happens because a glass pane has two sides which are parallel to each other. When the emergent light does not undergo any deviation by an angle, one cannot observe seven colours of the light separated in the form of a spectrum. However, a spectrum of colours can be viewed when the incident light rays fall on an object whose surfaces are not parallel, such as a triangular glass prism.
Hence the correct statement would be that a spectrum of colours appears when the light passes through a flat pane of glass.

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