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What is the cause of dispersion of white...

What is the cause of dispersion of white light through a glass prism Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and narrow beam of white light is allowed to fall obliquely on one of the faces of the prisms.

A

`i_(1)=i_(2)`

B

`i_(1)gti_(2)`

C

`i_(1)lti_(2)`

D

`i_(1)+i_(2)=90`

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The correct Answer is:
A
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