* Refractive Index: Oil has a higher refractive index than air. This means light travels slower in oil than in air.
* Snell's Law: This law describes how light bends when it passes from one medium to another. It states: n1 * sin(θ1) = n2 * sin(θ2), where:
* n1 and n2 are the refractive indices of the two media.
* θ1 is the angle of incidence (angle between the incident ray and the normal).
* θ2 is the angle of refraction (angle between the refracted ray and the normal).
* Higher Refractive Index, Smaller Angle: Since oil has a higher refractive index (n2 > n1), for the equation to hold true, the angle of refraction (θ2) must be smaller than the angle of incidence (θ1). A smaller angle means the refracted ray is bent towards the normal.
In Summary: When light moves from a medium with a lower refractive index (air) to a medium with a higher refractive index (oil), it slows down and bends towards the normal.
