why glass slab dont disperse the light into its constituents colors where as prism does?
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HOLA friend!!
Very good question....
THANKS a BUNCH for asking such an important question...
What is the difference between dispersion in a glass slab and dispersion in a prism?
The difference is that, in a glass slab, the emergent rays come out of the surface PARALLEL TO EACH OTHER, wile after dispersion from a prism, the light rays that emerge out are not parallel.
Our eye lens is a Convex (Converging) lens. Hence, when the dispersed parallel light rays (violet to red), after emerging from the glass slab, fall on our convex lens of our eyes, they converge to meet at the yellow spot on the retina. As they converge, all of them meet at a point, which gives us a white colour. Hence, light from a glass slab disperses, but we cannot understand it.
On the other hand, since the light rays after dispersion from a prism does not come out in parallel, as they fall on the convex lens of our eyes, they fail to converge AT ONE SINGLE POINT, hence we understand the seven colours almost distinctly.
Hope my answer is satisfactory!!
Thanks....
Very good question....
THANKS a BUNCH for asking such an important question...
What is the difference between dispersion in a glass slab and dispersion in a prism?
The difference is that, in a glass slab, the emergent rays come out of the surface PARALLEL TO EACH OTHER, wile after dispersion from a prism, the light rays that emerge out are not parallel.
Our eye lens is a Convex (Converging) lens. Hence, when the dispersed parallel light rays (violet to red), after emerging from the glass slab, fall on our convex lens of our eyes, they converge to meet at the yellow spot on the retina. As they converge, all of them meet at a point, which gives us a white colour. Hence, light from a glass slab disperses, but we cannot understand it.
On the other hand, since the light rays after dispersion from a prism does not come out in parallel, as they fall on the convex lens of our eyes, they fail to converge AT ONE SINGLE POINT, hence we understand the seven colours almost distinctly.
Hope my answer is satisfactory!!
Thanks....
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