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Index Values and Bending

APPH12-O9L4BZ

Light passes from substance A into substance B, and it bends as shown in the diagram.

Which of the following is accurate about the $n$ values of the two substances?

A

${ n }_{ A }>{ n }_{ B }$

B

${ n }_{ A }<{ n }_{ B }$

C

${ n }_{ A }={ n }_{ B }$

D

Nothing can be said for sure about n-values from the information in the diagram.