| help with a physics question please?
The diagram shows the passage of a ray of lightfrom air into a substance X. The refractive indexof X is: (nair = 1)A 0.74B 1.15C 1.29D 1.35E 1.47Pic can be seen here http://i59.photobucket.com/albums/g311/x-neney-x/phypic1.jpg
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