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Question
Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why?
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Solution
In rectangular glass slab, the ray undergoes the only refraction and emerges out parallel. In a prism, the emerging ray is not parallel but split due to change in wavelength of different colour of light. The shape of the glass slab with two prisms up and down splits light but recombines it into one.
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