Given refractive index of flint glass, \(n_{FG} = 1.66\).
Using the formula \(v_{FG} = \frac{c}{n_{FG}}\), where \(c = 3 \times 10^8 \, \text{m/s}\) (speed of light in vacuum).
Substitute the values to get:
\[v_{FG} = \frac{3 \times 10^8}{1.66} = 1.807 \times 10^8
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