A glass prism is able to produce a spectrum when white light passes through it but a rectangular block of same transparent glass does not produce any spectrum. Why?
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Answered by
31
this is because light separates only when the different colours bend and follow different paths but when passing through a rectangular block the light imerges parallel to each other
Anonymous:
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This is because a dispersion takes place in prism and light ray is refracted that is they are bent when it passes through one medium at an angle and changes its speed. The different wavelengths of light is passed at different speed this gives the color formation in prism. When the light passes through glass it has two interfaces one entering and other leaving. So the spectrum is formed by prism not by glass.
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Read more on Brainly.in - https://brainly.in/question/4957#readmore
Answered by
21
Explanation:
The rectangular prism is a parallel glass slab.
In a parallel glass slab light is refracted on both the parallel side.
This allows for lateral dispersion of light and results to a zero net deviation.
The different wavelengths of light are thus not deviated and hence the white light is not not split into constituent colors.
As for the glass prism since it is an angular prism the white light passing through the sides will have its constituent wavelengths being deviated and hence the white light is split into constituent colors.
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