Question

why dipersion occurs in prism but not in a glass slab​

Answer 1

The dispersion occurs in prism but not in glass slab because of the geometric design. In a slab, the opposite sides are parallel to each other whereas in the case of the prism, the sides are not parallel to each other. ... They travel a very small distance in the glass slab to meet the second interface

Answer 2

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In a prism, does the dispersion of light occur at the first face of the prism, or does it occur due to the second non-parallel surface of the prism?

Dispersion of light takes place at the first face of the prism but the second non parallel face also plays an important role in this phenomenon.

In a prism, does the dispersion of light occur at the first face of the prism, or does it occur due to the second non-parallel surface of the prism?Dispersion of light takes place at the first face of the prism but the second non parallel face also plays an important role in this phenomenon.If the two interface surfaces are parallel to each other, as in a rectangular slab, all of the bending and dispersion that takes place at the first interfaces is exactly reversed at the second, undoing the effect of the first interface. Although the emerging ray of light is displaced slightly from the entering ray, it travels in the same direction as the incoming ray and all wavelengths that separated at the first interface are re-combined.

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