Objective is to demonstrate how light bends (due to refraction or reflection) when it travels from medium to another. Explore what happens when light moves from rarer to denser medium, and vice-versa. Understand when does refraction take place, versus total internal reflection. Snell’s law comes in handy to understand the concept of bending of light. Additionally learn how a change of medium causes an impact to bending of light. Concept of refractive index is elucidated. Watch what happens to the angle of refraction when medium is changed.