Why does white light get dispersed in a prism but not in a rectangular glass slab, yet both are made up of glass ?
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The fact that refractive index is function of wavelength is called dispersion. Practically we observe splitting of white light in different wavelength components and hence different colors and call that phenomenon as dispersion.
In case of prism two refracting surfaces are not parallel and hence there is deviation of the Ray and dispersion is visible easily. In case of slab two refracting surfaces are parallel to each other and emergent rays are parallel to the incident Ray and they are closely spaced which makes it difficult to see the splitting of white light in different colors
In case of prism two refracting surfaces are not parallel and hence there is deviation of the Ray and dispersion is visible easily. In case of slab two refracting surfaces are parallel to each other and emergent rays are parallel to the incident Ray and they are closely spaced which makes it difficult to see the splitting of white light in different colors
Smarter111:
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