Question

Q5. (i)Explain the formation of rainbow in the sky with the help of diagram.

(ii) A glass prism is able to produce a spectrum when white passes through it but a glass salb does not produce any spectrum. Explain

Answer 1

1)rain droplets act as prism which splits the white light into spectrum, hence rainbow is formed just due to refraction
2)in glass slab the extended incident Ray is parallel to emergent Ray so that it cancels the dispersion of light