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HSC Together > Year11 > Applying Equations and Relationships to Solve Questions (Refraction Index, Snell’s Law, Critical Angle, Intensity of Light)

# Applying Equations and Relationships to Solve Questions (Refraction Index, Snell’s Law, Critical Angle, Intensity of Light)

### How do I apply the relationships below to make quantitative predictions?

In this post, we  apply equations and relationships to solve problems and questions or make quantitative predictions in a variety of situations, as a part of the Prelim Physics course under the module Waves and Thermodynamics and sub-part Ray Model of Light. We apply the following relationships below to assist us.

• n_{x} = \frac{c}{v_{x}} for the refractive index of medium , is the speed of light in the medium.
• n_{1} sin \theta _{1} = n_{2} sin \theta _{2} Snell’s Law
• sin \theta _{c} = \frac{n_{2}}{n_{1}}
• I_{1} r_{1} ^{2} = I_{2} r_{2} ^{2}   to compare the intensity of light at two points, r_{1} and r_{2}

The following three videos cover the range of relationships, and how to apply these to practice questions.