refractive index

Diagram shows the path of light travelling from air into liquid X.
Rajah menunjukkan lintasan cahaya merambat dari udara ke cecair X.


What is the refractive index X?

Berapakah indeks biasan cahaya X?

A 0.17
B 0.68
C 1.46
D 1.50
E 2.00

snell's law
n=(sin i)/(sin r)
n=sin 30 / sin 20
n=1.46