Question

why a glass slab is not able to produce a spectrum explain​

Answer 1

Explanation:

A glass prism is able to produce a spectrum , which is a patch of light obtained due to dispersion. This is because the opposite refracting faces of a glass prism are not parellal. ... Thus, a rectangular glass slab is unable to produce a spectrum due to the refracting faces being parellal to each other

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Answer 2

In a prism no matter where you shine the light into it, the exit surface is at an angle so the different wavelengths of light get separated because they spend different amounts of time traversing the medium and therefore get bent at different angles