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why dont we get a spectrum through a rectangular glass slab even on passing white light through it??

hi elder ,

i am thinking that ur question is wrong bcoz only through prism u can get spectrum colours. check out ur question plz!

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A glass slab acts like a combination of 2 prisms kept in a way as shown in the figure,


We can see a single light of beam as the output.

Because when a light passes through the prism 1 it decomposes the light into its constituent colors and when the constituent colors passes through the prism 2 the colors are recombined and form a single beam of white light!

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how to add pictures in answers?

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Just Copy-Paste works fine.

File:Light dispersion conceptual waves.gif

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