A beam of light passes from air into a substance X. If the angle of incidence be `72^(@)` and the angle of refraction be `40^(@)`, calculate the refractive index of substance X. (Given: `sin72^(@)=0.951` and `sin40^(@)=0.642)`

Explanation

To calculate the refractive index of substance X when a beam of light passes from air into the substance, we can use Snell's Law, which states:

\[ n = \frac{\sin i}{\sin r} \]

where:
- \( n \) is the refractive index of the substance,
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